No, I hadn't talked to Wik about this despite Adie giving me some contact details. Instead I emailed my accountant, who came up with a spreadsheet and some advice. Basically, it seems to be more advantageous to have a company bike if you do relatively few miles and have high repair costs (based on buying a fairly cheap bike like my K1100LT). The more miles you do the more you seem to gain by charging your company the mileage instead. With the fairly high mileage I do, I'm around the crossover point where it's better to not have a company bike. In my case, said point was around the 17k/year mark.