Our verdict
The cheap-and-cheerful Mountfield for buyers who do not need self-propel. Same engine as the SP46, half the secondhand price. If you have a flat lawn and decent fitness, ignore the SP46 and buy this.
Pros & cons
Pros
- Same Stiga engine as the SP46 for less money
- Push-only means fewer cables and parts to fail
- Light enough for an average user
- Massive used supply
Cons
- Push-only is tiring on big lawns
- No rear roller
- Plastic wheels wear out
Full specs
| Type | Petrol |
|---|---|
| Cut width | 46 cm |
| Engine / Power | Stiga ST120 123cc |
| Weight | 24 kg |
| Deck | Steel |
| Self-propelled | No |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | 55 L |
| Suited to lawn | Small |
| Noise level | 95 dB |
Buying second-hand
£60–110 used is the right zone — these come up constantly on Marketplace. Same engine checks as the SP46: no oil leaks, golden oil, fires on first or second pull. The HP46 is the most plentiful petrol mower in the UK — never overpay; another will appear next week.
Where to buy the Mountfield HP46
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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
|
£10 | £3 |
|
Spark plug
|
£8 | £3 |
|
Carburettor service kit
|
£25 | £10 |
Fair-offer calculator
Tell us about a specific used listing for the Mountfield HP46 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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