People might find these links to travel and weather information useful in the current #uksnow adventure:
UKOnline’s Travel Information Page
National Rail Enquiries (when it is up!)
Live Departures – Charing Cross
Live Departures – Victoria
Live Departures – Waterloo
Live Departures –Cannon Street
Live Departures –Liverpool Street
Live Departures – Kings Cross
Live Departures – Euston
Live Departures – Paddington
BBC Travel Alert Twitter page
Ben Marsh’s #uksnow page
These sites tend to get a lot of traffic so if you cannot connect you may want to check the status of the site.
Lost ConsCIOusness 
Only useful for London. http://uksnow.benmarsh.co.uk might have useful links for the other 90%
Mea culpa, despite having lived in Manchester and Sheffield I was focusing on local conditions 🙂 Thanks for the very useful link