We offer a free delivery service for all machines within a 30 mile radius. Not only that; we build, inspect and run up every machine prior to delivery. Making sure you get a fully functional machine that is set-up and ready for use. On delivery we will run through with you any instructions & maintenance advice so you are comfortable with your new machine.
Allett Kensington 17 17" Petrol Cylinder Mower
Price range: £2,089.00 through £2,469.00 inc. VAT
Allett AHCS-1 Quick/Ultra Change Cartridge Stand
£149.00 inc. VAT
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Allett Kensington 20 20″ Petrol Cylinder Mower
Price range: £2,499.00 through £2,659.00 inc. VAT
The Allett Kensington 20 is the ultimate self-propelled petrol cylinder mower for discerning home gardeners. Designed for medium to large lawns, it delivers a flawless, striped finish and features an innovative interchangeable cartridge system for total lawn care.
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Description
Why buy the Allett Kensington 20 20″ Petrol Cylinder Mower?
- Choice of powerful and reliable Briggs & Stratton or Honda petrol engines.
- 20-inch (51cm) six-bladed precision cutting cylinder delivering 79 cuts per metre.
- Interchangeable Quick Cartridge (QC) system transforms the mower into a complete lawn care tool.
- Steel front and double-section rear rollers for classic, sharp lawn stripes.
- Infinitely variable micro-set cutting height adjustment from 6mm to 32mm.
- Self-propelled drive for effortless mowing on medium to large lawns up to 900m².
The Ultimate Mower for the Lawn Enthusiast
Designed for keen home gardeners with medium to large lawns up to 900m², the Allett Kensington 20 Petrol Cylinder Mower is the flagship machine in Allett’s Homeowner range. It combines a professional-grade cut with the versatility of an interchangeable cartridge system, allowing for a complete range of lawn care tasks from a single, expertly engineered machine. Customers can see the exceptional build quality for themselves at the Sims Garden Machinery Stratford-upon-Avon showroom.
Precision Cutting Performance
At the heart of the Kensington 20 is a six-bladed precision cutting cylinder that delivers an impressive 79 cuts per metre. This scissor-like action provides a clean cut that avoids tearing or bruising the grass, promoting a healthier, more vibrant lawn. A fixed spring tine comb lifts the grass prior to cutting, ensuring an even and consistent finish. The infinitely variable micro-set adjuster provides precise control over the cutting height, with a range from just 6mm up to 32mm (¼” to 1 ¼”).
Engineered for Perfect Stripes and Easy Handling
The hallmark of an Allett lawn is the classic, sharp stripe, and the Kensington 20 excels in this regard. It features a zinc-plated steel front roller and a heavy, double-section steel rear roller with a differential. This design not only produces beautiful stripes but also allows for smooth, effortless turns without scuffing or damaging the turf. The mower is self-propelled, reducing operator effort, and features three handlebar height positions which also fold for convenient storage and transport. A large 70-litre grassbox minimises time spent emptying clippings.
A Complete Lawn Care System
The Kensington 20 is far more than just a mower. Its key feature is the compatibility with the Allett Quick Cartridge (QC) system. The standard six-blade cutting unit can be quickly and easily replaced with a range of optional cartridges to enhance your lawn care routine. These include a 10-bladed cutting cylinder for an even finer finish, an Aerator, Lawn Brush, Dethatcher, Scarifier, and a Verticut cartridge. This versatility makes the Kensington 20 a true all-in-one lawn maintenance solution.
Authorised UK Dealer Support
As an established, authorised Allett UK dealer, Sims Garden Machinery offers more than just a machine in a box. With a history stretching back over 100 years, the business provides complete peace of mind. The trained sales staff in the Stratford-upon-Avon showroom are on hand to offer expert advice, ensuring you choose the perfect model. For local customers, every Allett mower comes with a free Pre-Delivery Inspection (PDI) by trained mechanics, personal local delivery, and a full handover demonstration to ensure you are confident and ready to start mowing.
Not sure which machine or part is right for you?
Our team is here to help. Contact us today for expert advice.
Our team is here to help. Contact us today for expert advice.
Technical Specification
| Engine Options | 127cc XR550 Briggs & Stratton or 122cc GX120 Honda |
| Start Method | Recoil Start |
| Fuel Tank Capacity | 2 Litres |
| Drive System | Self-Propelled |
| Cutting System | 6-Blade Cylinder (Quick Cartridge) |
| Cutting Width | 51cm / 20″ |
| Cuts per Metre | 79 |
| Cutting Height | 6mm – 32mm (¼” to 1 ¼”) |
| Height Adjustment | Micro-set adjuster |
| Cartridge Compatibility | Accepts all Allett 20″ QC cartridges |
| Grass Rake | Fixed, adjustable spring tine rake |
| Grassbox Capacity | 70 Litres |
| Front Roller | Zinc-plated steel |
| Rear Roller | Double-section steel with differential |
| Handlebars | 3 height positions, folding |
| Overall Width | 68cm (27″) |
| Weight (with grassbox) | 56.6 kg |
| Recommended Lawn Size | Up to 900m² |
| Warranty | 2 years homeowner use |
Why buy from Sims Garden Machinery?
Authorised main dealer
We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on.
Real people, real support
No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help.
Expert advice — not pushy sales
Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine.
Established, independent family business
We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth.
Frequently Asked Questions
What is the main benefit of a cylinder mower like the Allett Kensington 20?
A cylinder mower uses a series of blades on a rotating cylinder to create a precise, scissor-like cut. This clean cut is healthier for the grass than the tearing action of some rotary mowers, resulting in a finer, more manicured finish, which is why they are the choice for formal lawns and sports turf.
Does the Allett Kensington 20 create lawn stripes?
Yes, absolutely. The Kensington 20 is specifically designed to create sharp, classic stripes. It achieves this with its heavy steel front and double-section rear rollers, which bend the grass blades in the direction of travel to create the light and dark striped effect.
What lawn size is the Kensington 20 suitable for?
The Allett Kensington 20, with its 20-inch (51cm) cutting width and self-propelled drive, is ideally suited for keen gardeners with medium to large-sized lawns, specifically recommended for areas up to 900 square metres.
How does the interchangeable cartridge system work?
The Allett Quick Cartridge (QC) system allows you to remove the main cutting cylinder and replace it with other specialist lawn care tools, such as a scarifier, dethatcher, or aerator. This transforms your mower into a versatile, all-season lawn maintenance machine, saving you space and money compared to buying separate dedicated equipment.
User Manuals / Downloads
Additional information
| Brand | Allett |
|---|---|
| Blade Brake ClutchIndicates if the blade can be stopped while the engine keeps running. | FALSE |
| Collector SizeThe capacity of the grass collection bag or box in litres. | 70 |
| Cutting MethodThe cutting mechanism used (e.g., Rotary or Cylinder). | Cylinder |
| Cutting WidthThe width of the grass cut in a single pass. | 51 cm |
| Drive TypeHow the mower is propelled (e.g., Push, Self-Propelled, Variable Speed). | Self-Propelled |
| Electric StartIndicates if the machine features a key or push-button electric starter. | FALSE |
| Mowing FunctionsAvailable mowing modes (e.g., Collection, Mulching, Side-Discharge). | [“Collection”] |
| Rear RollerIndicates if the mower features a rear roller for creating lawn stripes. | TRUE |
| Engine | Briggs & Stratton XR550, Honda GX120 |
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About Allett
At Sims Garden Machinery, we sell a range of Allett Mowers, famed for their high quality. We stock both petrol and battery-powered walk-behind mowers. Built around a cylinder design, these machines offer an unrivalled cutting performance, for use in domestic and commercial environments. We also stock a range of additional cartridges that can be attached to Allett Mowers, for use as verticutters or scarifiers.
Our garden machinery can be delivered across the UK, with a skilled member of our team assembling it and demonstrating correct usage to you upon arrival. This ensures the longevity of all equipment purchased from Sims Garden Machinery.
If you have any queries about our range of Allett Mowers, talk to a member of our expert customer service team today. Sims Garden Machinery is a family run business based in the UK, with over 100 years of experience selling gardening equipment. Our team possesses a deep understanding of our garden range.
Shipping & Delivery
FREE PDI, DELIVERY & HANDOVER
NATIONAL DELIVERY
- Each machine will be tested prior to delivery.
- Orders will be sent out via either ThePalletNetwork or DHL insured service.
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