The Cycle to Work Scheme is a government initiative that lets you make big savings on your bike by paying through tax-free salary sacrifice.
A higher rate taxpayer saves 42% of the value of the bike and a standard rate taxpayer saves 32%. Additionally, the employer saves 13.8% on Employers National Insurance and may well be able to claim Capital allowance on the purchase. This will give the employer a 31% return on investing in a bike for you to use for commuting.