Hi, I want to change my boiler, got vokera 80-20 15 years old, still .ok However, I think an upgrade would be beneficial, BUT, which one? I wasthinking Worcester 30KW.Valiant are dearer.30kw.Which are the "best buys" for quality for money, reliablity in that range ? I notice worcester and valiant seem to be out of vogue and Vokera have a new one out.Whats the pros choice? any advice appreciated.Prepared to pay for quality.but not just the name. combi-condensing.