Rubbish Tax people
I was chating to my brother in law about this very topic, he's an accountant.... never mind, however he was saying that it is not 15% that you pay, you could end up splashing out 50% of the value of the bike, also the company is not under any obligation to sell you the bike, if they let it go for anything less than 15% the tax people can tax you for it as they see it as a gift from the company to you. some people may have been able to get the bike for 15% but the tax people are not happy with that percentage... Rubbish I know. We had a long chat, I nearly fell asleep twice.
Also if you leave your employment you still have to keep paying for the bike although the bike stays with your emlpoyer, you could end up paying more for the bike than just buying it yourself,