Winter frost damage fixed!! Rog replaced the shower mixer tap today without any problems, and the parts we ordered for the drinking water tap arrived and have been fitted. We turned on the water pump, ran the taps, and the Webasto – water and central heating, and all seems to be working fine. So far there are no puddles on the floor to indicate any broken pipes, and the water pump turned on and off when expected and stayed off, which I don’t think it would have done if we had any leaking pipes. So, all in all, I think we’ve come off lightly. Fingers crossed!!!