Yard Force · launched 2024
Yard Force MB400
From £349.99 (400 m² version) · versions up to 400 m²
Quick verdict
Good for
- Trees, buildings or no signal (follows a wire)
- Lawns with no Wi-Fi or phone signal
- Tighter budgets (MB400: £349.99)
Watch out for
- Boundary wire to peg round the lawn first (included)
- Only rated for 30% slopes
£349.99 for the MB400 (400 m²) · spec score 5.2/10 · checked 17 October 2026
Boundary wire. Rated for lawns up to 400 m². Slopes up to 30%. Mows without Wi-Fi: Yes
MB400 versions, UK prices and 5-year cost
| Version | Lawn | Price | Stock | Runtime | 5-yr core (Wi-Fi) | 5-yr core (no Wi-Fi) | With remote | Score |
|---|---|---|---|---|---|---|---|---|
| MB400 | 400 m² | £349.99 | In stock | — | £726 | £726 | same | 5.2 |
Prices from the seller's UK website on 17 October 2026. Where we can read the seller's page automatically, today's price is shown too. Prices change often; check the seller before buying.
Without Wi-Fi, subscriptions and 4G
Follows a boundary wire pegged round the lawn, so it needs no Wi-Fi or phone signal to mow.
Bluetooth app; no extra charges.
Data note: Includes 100 m of wire and 120 pegs. Warranty is 2 years plus 1 year on registration.
5-year cost for the MB400
| 5-year cost item | Cost | Basis |
|---|---|---|
| Price of the MB400 | £349.99 | UK price checked 17 October 2026 |
| Blades | £200 | £40/yr assumption; no blade price published |
| Electricity | £75.60 | 8 kWh/month × 7 months × 27p (assumption) |
| One replacement battery | £100 | Assumption: £20 per Ah, minimum £100 |
| Core cost, lawn with Wi-Fi | £726 | |
| Plan needed to keep mowing with no Wi-Fi | £0 | Follows its boundary wire; no Wi-Fi or phone signal needed to mow. |
| Core cost, lawn without Wi-Fi | £726 |
MB400 reviews: what independent testers found
We have not found an independent UK or European review of this model yet. We will add one when it is published.
Owner reports
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MB400 specifications
| Navigation | Boundary wire |
|---|---|
| Base station / antenna | None |
| Built-in 4G | No |
| Drive | Not published |
| Max slope | 30% (about 17°) |
| Cutting width | 160 mm |
| Cutting height | 20–55 mm |
| Edge cutting | Not published |
| Obstacle sensing | Not published |
| Wildlife features | Not published |
| Rain | Not published |
| Noise | Not published |
| Water resistance | Not published |
| Weight | Not published |
| Narrowest passage | Not published |
| Mowing zones | Not published |
| Anti-theft | Not published |
| Warranty | 3 years |
Hedgehogs and wet lawns
Wildlife: No specific wildlife feature published. Whatever the mower, schedule it for daytime only. Read why.
Rain: No rain sensor published. Wet-lawn advice.
Sources
- Yard Force UK official store (MB400 listing) checked 18 Oct 2026