Had the same water system in my house for 2 years and everything has always run well. However a couple of weeks ago the ballcock in the cold tank in the loft broke and the tank ran dry, the next day it had filled up again - and everything was working again, however a few days later I changed the ballcock anyway and again everything was fine, but 2 days later the shower is struggling, on just a hot setting it works but on a cold mixed setting it keeps stopping and starting and then finally dies. The water tank in the loft is full and seems to be doing its job, any ideas where to look for the prob??
Thank you!!