Safely thawing frozen water pipes
"...how to thaw out your pipes safely:
Fill up your kettle, then find your stop tap and turn off your water
Turn on all your household taps to let the water run out
Make a hot water bottle with your kettle water, wrap in a tea towel and hold it against your frozen pipe (thawing can take a while, so please be patient)
After the pipe has thawed, wipe some kitchen roll along it to see if there are any leaks."