Flying to / from Heathrow – 22 or 23 March ?

There is rather a cryptic post in the Transport for London website referring to a train closure for this weekend. I’m unclear whether this means Heathrow Central will be the terminus for all trains that weekend – i.e. no trains to T5 and T4 or whether services will end at Hatton Cross with buses to the terminals. I’ll post when more is published.