Source London was originally a Transport for London-led consortium of public and private sector organizations. The IT infrastructure was developed by Siemens and the network is partly funded by Scottish and Southern Energy and National Car Parks. Other organisations involved include Heathrow Airport, Gatwick Airport, Asda, Capital Shopping Centres, Sainsbury's, IKEA, Whittington Hospital, Enterprise Rent-a-Car and London Underground. The Department for Transport provided £9.3 million 50% match funding for the development of the network's infrastructure. The subscription fee for the scheme was originally an annual flat-rate £10 per vehicle, with no per-charge fees.
