TransportAPI

TransportAPI is a platform for transport data and development available for UK that offers APIs for live departures, timetables, journey planning that includes private car, public transport or taxi, transport access point plus streets, postcodes and places, by name, code, or location, access to GTFS data, actual routes taken by buses between stops for every bus service in the UK, bus service data by operator, line name or location, fares data, and historic and real-time snapshots of the public transport network. (source: TransportAPI)