Hi, I would really appreciate some help with diagnosing a fault with my 12 year old boiler (Glow worm compact 80p). While having a shower the water intermediately changes from hot to cold and doesn't maintain a constant temperature. I called out a centrally heating boiler specialist who changed the heating temperature but informed me the boiler is on its way out due to scaling. He gave me a quote to replace the boiler for £1,800 being a Worcester 28 J Junior. Is this a fair price and is there anything else I can do to save some money. Thank you for help and advice?