Some years ago during the arctic temperatures, a pipe burst and due to the fact that the stop cock was in an awkward place and very stiff, it was not possible to close it easily. All is well now but wanted to make sure that this scenario would not happen again. I phoned Simon the plumber who told me about this switch that could be put in instead of the stopcock tap, SureStop
Simon came and within the hour a new, easy to deal with switch was put in. For £36 and a gem I now have peace of mind. thank you Simon for the info as well as putting the gadget in for me.