For years the bike to work/salary sacrifice scheme has largely worked on the basis of assumptions and blind eyes.
Initial assertions were that people could save 50% (with "up to" added fairly quickly). That figures was only remotely true for high rate taxpayers (i.e. not most people).
There also had to be a willingness for employers to a) sell and b) for not much money.
The 'practice' has been for most employers to ask for a nominal 5% - in spite of the official guidance (9.3) "We therefore advise employers that they can indicate in accompanying literature that ex-rental equipment may be sold for market value but they should make it clear that they cannot commit themselves to doing so"
Now the Revenue is saying "market value" is 25% - which for a year old bike still seems cheap, but throws the whole economics of the Scheme up in the air - for companies, employees and bike shops.
Lots more here - http://www.bikebiz.com/news/32690/HMRC-spanner-thrown-into-wheel-of-Cycle-to-Work-Scheme
Including -
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"From my reading of [HMRC's rule change] the employer can sell the bike to the employee for whatever they like, ie £5. However the difference between the amount that the employee pays for the bike and HMRC’s valuation of the bike would become a benefit in kind and therefore taxable.
"
It's not clear whether Cameron & Co. will turn a blind eye to this new twist, they may need any money saved - even if it's at the expense of what was quite an effective way of getting more people cycling.
No doubt the HMRC was swayed by stories of people buying serious off-road bikes that were unlikely to be used for commuting...