Thought I should start on the right track and say hello! I feel I should apologise for unashamedly coming for advice as a DIYer. I'm pretty much prepared to tackle anything going wrong in my house. My main pluming related claim to "fame" is having kept a Potterton Supreme / Gledhill Boilermate system running for 21 years with the help of the Gledhill forum. Biggest job was diagnosing a blocked feed to the Gledhill and adding a new feed via the header tank to the Gledhill drain tap. Now need advice on my new Veissman Combi! Hope you don't mind!