I hope this does not contravene Flyertalk forum regulations, but we have been putting together a plan to help travellers stranded in the UK. (Our proprietor is currently stranded in Japan!)
Spareroom.co.uk has asked all users with rooms to let if they are prepared to offer short-term lets to help stranded travellers with accommodation. We are offering those stranded, free access to the offers of help (no strings).
So far (One hour into the exercise of asking landlords) there have been 150 positive acceptances with rooms available.
Please tell anyone you know to be stranded and needing a room, to look out for press announcements with the special link they will need for their airport. We are contacting Embassies also, so they should be able to help with internet access to the site.
{Link added in by moderator}
http://www.spareroom.co.uk/stranded