The programme will fund 120 vehicles in ANC's fleet and provide manufacturer support. It took just six months to implement.
The companies say the speed and success of the contract can be attributed to the close working relationship forged between Whitechapel and ANC.
ANC human resources manager Wendy Dean said: 'With the change in company car taxation, many of our employees would have experienced a reduction in their net pay.
'The scheme was introduced to give employees a wider choice of car without suffering financially. Previously, company car owners were limited to certain makes and optional extras were not part of the scheme. Whitechapel's car ownership scheme allows each employee to select the vehicle and specification they require without losing out financially.'
All employees entitled to a company car within ANC are to be included in the scheme. Dean added: 'Our staff are already enjoying a wider choice of vehicles available and the opportunity to trade up or down on the market car allowance by 20%.
'We can also offer an interest free loan which reduces the repayments for the driver. The scheme also enables employees to buy the car at a guaranteed residual value at the end of the finance period.'
Whitechapel business development manager Sue Wintrip said: 'We worked very closely with ANC, which allowed the scheme to be implemented in record time.
'Our experience of car ownership schemes enabled us to effectively guide ANC towards a successful programme.'