FYI - LHR had to cancel a lot of flights because of weather conditions (see
http://www.pprune.org/airlines-airpo...ons-today.html). While we were all caught out in it (me ex-DUB into LTN instead of LHR), that does not mean T5 is not working. You should've seen LTN. None of the airport employees were remotely helpful with the exception of one baggage handler who offered to look for the passenger information people, but, alas, they were no-where to be found.
S.