Hi all, We had central heating installed, for mum, last year. Mum turns the thermostat right down at night and then up to 30 if she wants warmth. I need to buy a cover so it can stay at a constant, comfortable, temperature. My intention is, if she can't see the dial, she won't fiddle I've looked online but can only find clear covers, with a lock. Not what I want. I just want something simple that covers the dial. Out of sight out of mind. Any ideas?