Most of it has been covered already here but cyclescheme do take ownership for a further two years to reduce the value of the bike and to do so take a smaller % final value fee as Rotty has said.
Most places will have a different price on cyclescheme as they take a 10% fee from the voucher. If you wanted a bike at £2000, your £1000 voucher is only really worth £900 to a shop so you would be paying £1100 + your £1000 voucher to get that bike.
If a bike retailed at £1000 but had 20% off making it £800 the shop couldn't take another 10% hit on the £800 as that would be the margin gone. In the end the shop want £800 for that bike if they sold it normally so a voucher of £888 would be required for the shop to be paid the £800 they always wanted for the bike.
Total cost of bike and accessories: £1000
Net cost of bike and accessories, including finance and admin costs (if applicable): £1000
Income tax saving over hire period: £400
Employee NI saving hire period: £20
Final cost of bike & accessories: £580
Total saving: £420
Gross salary sacrifice, based on 12 month hire period (this should be the figure displayed on your hire agreement): £83.33
Net salary sacrifice, based on 12 month hire period: £48.33
Percentage saving over RRP: 42%
£48.33 net x 12 months making it £580. Add to that the 7% fee as the bike is over £500 makes it £650 in total for a £1000 bike if you are a higher rate tax payer.