The airline has agreed a new deal with Heathrow Express and First Great Western, which comes into action on December 5.

Once in place agents will be able to book customers’ travel starting from 11 First Great Western stations including Oxford, both Bristol Parkway and Bristol Temple Meads, Bath, Penzance, Cardiff and Exeter.

Customers will be able travel from their home stations to Paddington where they can then catch the Heathrow Express to the airport.

The deal also means should a train delay or a missed connection lead to a missed flight, the airline will get the customers on to the next available flight that day or pay for overnight accommodation if necessary.

BA head of UK and Ireland sales Stephen Humphreys said: “This is a great new way for our customers living in Wales and the West Country to get on track right from the start to enjoy a terrific trip with British Airways.

“Our partnership with First Great Western and Heathrow Express will make flying more accessible and convenient for customers travelling from regions in the UK without local airports.”

Keith Greenfield, managing director of Heathrow Express, said: “This partnership removes a layer of hassle for customers and affords them extra protection against possible problems. This kind of joined-up travel is what today’s leisure and business travellers expect.”

Mark Hopwood, managing director of First Great Western, said: “This is all part of our work to make journeys easier and simpler for our passengers.”