Buying a bike through the company
If you travel between sites for your work, and the distances allow, you could consider buying a bike through the company. In strictness this should be bought through the cycle to work scheme, but in our experience it's unlikely that HMRC would have an issue if you bought a mid-range hybrid bike for business use only outside of the cycle to work scheme. However if you buy an expensive, top of the range road bike, if you were to have an HMRC inspection and this was queried, HMRC may have more of an issue!
You need to ensure that the bike is only used for business (to avoid a benefit in kind). You can also charge reasonable maintenance and service costs as long as these are in line with the average business mileage you do using the bike.