If there are any travellers who need a place to stay in London because of delayed flights or rail services, there are options that won't cost the earth.
The YHA Earl's Court hostel has beds in shared rooms from about £17 - 19 a night, for at least the next four or five nights. The hostel is very near Earl's Court station, was recently refurbished (in 2009) and offers self catering for those who may be tired of eating in restos. It's not fancy but it offers safe and secure accomodation; the journey from Earl's Court to Heathrow takes about 35 mintues on the Piccadilly line.
For those who prefer other accommodation, Aston's Apartments has availability too. Studios and larger apartments are available from about £85 a night; the flats are a short walk from Gloucester Road station, again an easy journey to Heathrow airport.