My bathroom is over my garage, and it currently minus 11 here. The bath taps both hot and cold have frozen, as the pipes are in an outside wall. I can't get to these pipes to thaw them out. The shower, sink and toilet are fine and not frozen. The heat in the house has been kept on continually at a minimum temperature of 15 degrees Celsius (higher during the day).

I have turned both bath taps on (although nothing is coming out of them) in case the pipes start to thaw.

What if anything should I do to help minimise any damage from these pipes/taps freezing and then thawing?

If I go away should I turn the water in the house off at the mains?

Any advice would be greatly appeciated. Jane