Tks guys. Im in Dublin and looked up the cost on the internet and in the uk its about 80 - 160 gbp for a fan. so 335 euro  plus labour on top of the 90 sounds a bit much.
Going to get a second opinion tomorrow from a guy  who wont charge a call out and he said I might be better off replacing the boiler as it shouldnt be causing this much trouble after 5 - 6 years.
                
 Broke and cold
                
 September 2009