Our verdict
B&Q's house-brand petrol that does the job for a medium UK lawn at a fair price. The Loncin engine isn't exciting but it starts and runs reliably with annual servicing. Trade up to Mountfield SP46 for £30 more if you want a UK-icon mower that holds resale value.
Pros & cons
Pros
- B&Q-supported with parts on shelf
- £269 for a self-propelled petrol is good value
- 3-year warranty registered online
- Loncin engine is competent if uninspiring
Cons
- Loncin engine is no Honda — expect 7-10 years not 15
- Cheap drive cable stretches early
- Plastic wheels wear out quickly
- Reviews mixed on first-cut quality
Full specs
| Type | Petrol |
|---|---|
| Cut width | 46 cm |
| Engine / Power | Loncin 139cc OHV |
| Weight | 32 kg |
| Deck | Steel |
| Self-propelled | Yes |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | 60 L |
| Suited to lawn | Medium |
| Noise level | 95 dB |
Buying second-hand
£90-160 used. The drive cable is the weak point — if it's stretched, the self-propulsion will be feeble. £18 to replace as DIY. Always check B&Q can still order spares for the model (some Mac Allister generations get end-of-lifed quickly). Avoid examples with cracked deck mounts.
Where to buy the Mac Allister MLMP46SP-2
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Repair-cost reference
UK 2026 ballpark prices for the parts you're most likely to need on this mower. OEM is dealer-genuine; aftermarket is what you'll find on eBay or generic small-engine suppliers. Use these to sense-check any quote and to negotiate on used buys.
| Part / job | OEM | Aftermarket |
|---|---|---|
|
Replacement 46cm blade
Annual sharpening is free; replace when bent or cracked.
|
£24–£32 | £8–£12 |
|
Foam air filter
|
£8 | £3 |
|
Spark plug
|
£6 | £2 |
|
Generic carburettor
|
£28 | £14 |
|
Drive cable replacement
Stretches at 5–8 years. 30-minute DIY fit.
|
£18–£28 | £8 |
Fair-offer calculator
Tell us about a specific used listing for the Mac Allister MLMP46SP-2 you're looking at. We'll compute a fair offer range from our used-market data and the condition signals you provide.
Calculations are guidance, not gospel. Used-market prices vary by region (Scotland is typically 10–15% cheaper than the South-East), season (October cheapest, March most expensive), and seller motivation.
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