I see from next week the National Express A6 bus from Paddington to Stansted is included on the train data feeds:
See hereRuns on behalf of
GW» apparently, any reason for this? Some sort of tie-in between NX and
GWR▸ 
National Express coaches are largely a franchise. Until 2010, routes such as the 402 and 403 ... Wiltshire into London - were operated by First Avon and Somerset. Is it possible that the A6 will be operated by First, and / or in association with HEX? From Heathrow and from the Thames Valley and beyond to the South West and South Wales, train to Paddington and coach to Stansted could be more attractive that Hammersmith and City to Liverpool Street and a further train ...