Judging by the report on BBC news 24 about T5 at Heathrow being closed, and BA handing out letter to prospective passengers telling them that BA can't arrange hotel accomodation due to the numbers of passengers involved & advising them to leave the airport , it seems not.
Not a very good advert for BA's customer service planning if this is the case.
Not surprising actually, as BA would quite likely be unable to organise a pi55-up in a brewery.