Electric machines are cheaper to run than petrol-engined ones because servicing costs are less. Oil, air filter and other parts have to be bought, even if you service the engine yourself.

Before buying a mower, check that all parts are readily available.

If you check the lawn for stones before mowing and are careful to mow only grass, the blades should remain in good condition. You can also buy abrasive strips to attach to cylinder mowers to keep the blades sharp. Rotary blades are easy to remove and file smooth (there is no need for a razor-sharp edge).

Routine cleaning removes corrosive grass sap, so keeps metal parts in good condition. Note the mower's design - will it be easy to clean?