hi, i have a combi gas boiler glowwarm swift flow. i have a BG engineer came out to installed fan. he noticed that pilot was keep going out so, after the investigation he is saying that he would recomend a powerflush to clean our radiator pipes as its contains sludges and other stuff. He quoted us £690+vat. Could any help and is that average or can i find some one cheaper and where would be able to find a person in birmingham. i have seen powerflush machine in HSS for cheaper rate + chemical. is it hard to use it myself or if i hire from them would i be able to get someone to come out to do it for me for a nominal fee. Does any one know anyone in birmingham who can do it for cheaper.