Not much of an update, but from the most recent diagnostics and clearing codes the radiator fan does not start as soon as engine starts up or kick in whilst driving. I've done approx 200 miles since the fan problem, but now my temp gauge takes a while to get to half way. On the motorway recently the gauge even dropped 2 bars whilst driving. Seems to stay at half way in everyday traffic, but takes a while to show (approx 25mins). I'm going to get the car back into the garage in Jan as fuel economy seems fine, but don't trust the temp gauge due to recent problems.