Why would i not ask for an opinion ,if problem was something simple i could do myself and not get the experts in i would have a go ,it's called learning .i have picked up a lot of useful skills over the years by having a go from fixing motorcycles and cars to plumbing and electrics ,the internet has accelerated the ease of learning new skills by being able to pick the brains of those willing to share their knowledge (like this site) boilers i know little about hence my original post .