Thanks all for the replies.
I suspect it is more than just the weather as it's been fine for the last few weeks when the temperature has been colder, and it significantly changed from when we had a shower in the morning to the evening. It was absolutely fine in the morning yet freezing cold...
Wonder if anyone can offer any advice - we have a Mira Sport electric shower which has been running fine for over 8 years.
In the last week, we have a problem with the temperature of the water. We have to turn the temperature control up to maximum (which we've never had to before as normally...