BAA
In March 2018, Heathrow Airport Holdings came to an agreement with Great Western Railway (GWR) to take over the operation of the Heathrow Express service between London Paddington and Heathrow Airport from August 2018. In September 2019, Heathrow Express confirmed that operation of the service would pass to GWR with ownership remaining with Heathrow Airport Holdings until at least 2028. GWR would provide and maintain the Class 387 units for the service from 2020, with the Class 332 trains withdrawn from service.