SP46
"Britain's best-selling self-propelled petrol"
RRP New
£329
Manufacturer
Buy Now
£279
Lowest UK retailer
Used Avg
£140
Facebook / eBay UK avg
★ 4.3 (1,240) · Value 8.6/10
Full SP46 review →
SP41
"SP46 predecessor — UK best-seller in the 2010s"
RRP New
£329
Manufacturer
Buy Now
£249
Lowest UK retailer
Used Avg
£110
Facebook / eBay UK avg
★ 4.2 (945) · Value 8.2/10
Full SP41 review →
Verdict — which one to buy
Our take
The 5cm cut difference matters less than the used supply. SP41s are usually £20–40 cheaper but harder to find clean. SP46 is the volume seller; if you find a tidy SP46 at SP41 money, take the bigger one.
Spec-by-spec
| Mountfield SP46 | Mountfield SP41 | |
|---|---|---|
| RRP | £329 | £329 |
| Buy now | £279 | £249 |
| Used avg | £140 | £110 |
| Type | Petrol | Petrol |
| Engine / Power | Stiga ST120 OHV 123cc | Mountfield RV150 OHV 123cc |
| Cut width | 46 cm | 41 cm |
| Weight | 27 kg | 25 kg |
| Self-propelled | Yes | Yes |
| Rear roller (stripes) | No | No |
| Mulching | Yes | Yes |
| Bag capacity | 55 L | 50 L |
| Suited to lawn | Medium | Small |
| Noise | 95 dB | 95 dB |
| Rating | 4.3 / 5 | 4.2 / 5 |
| Value score | 8.6 / 10 | 8.2 / 10 |
Pros & cons of each
Pros
- Best-value self-propelled petrol on the UK market
- Stiga engine is reliable and parts are everywhere
- Light at 27kg — easy to push and store
- Huge used supply keeps prices low
Cons
- Plastic deck not as durable as steel
- Cable-operated drive less smooth than Honda
- Rear flap hinge a known weak point
Pros
- Self-propelled at budget price
- Same Stiga engine family as the SP46
- Light enough to lift into a car
- Spares are everywhere
Cons
- 41cm cut narrow for modern lawns
- Plastic deck dents on stones
- Drive cable stretches with age
Want to compare more?
Open the full compare tool, filter by brand or budget, and pick up to 4 mowers to view side-by-side.