my dad whose 78 has had problems with his old microbore system and over the past 12 months has spent a fortune on repairs to it. the problems started with a lack of proper heat to the radiators and various plumbers have 'fixed' the fault then given up--the cicuit cintrol board has been replaced,also the control valves and the pump,finally he has lost heat and water completely. the boiler is old but has always been serviced and appears fine--it is a classic standard? --all work has been done by proffessional plumbers who eventually walk away. he's so fed up with it all that he is looking into replacing the whole system--can anyone offer any possibile further ideas--i appreciate that you cannot see the set up etc but any ideas might help,thanks.