Can I claim mileage if I deliver by bike?

Yes. HMRC's approved rate for a bicycle is 20p per business mile, and unlike a car there is no 10,000-mile threshold - every business mile is at the same rate.

The same rule about what counts applies: from your first pick-up to your last drop-off is business, and home to the zone you work is commuting.

An e-bike counts as a bicycle for this purpose. As with a car, the rate covers the whole cost of running it, so you cannot claim the mileage rate and also the cost of the bike, its servicing or its electricity. If you bought an expensive e-bike specifically for the work it is worth asking an accountant whether claiming actual costs and capital allowances beats the flat rate.