I think ASN needs a plumbers section soon! lol Anyways, I have a Worcester Combi as pictured below, it's working fine, but the timer part is goosed, it's dropping 3hrs a day which is kind of annoying, unless I'm here everyday! Where's the best place to buy a replacement, and anyone has a how to on how to change it? I know it just pushes on, but I have no idea on how to get it off! Worst case is to call the engineer out and get him to replace it, and get raped at the same time. I don't know the model number unfortunately.