Did find a Corgi fitter to replace the fan, ordered and fitted next day. Delighted with service and no comments about how the boiler ought to be pensioned off. Boiler now amazingly quiet.
However, let's not pretend it's easy to find a Corgi fitter. Plenty in the book, lots on the Corgi web site but can you actually get one to reply to messages you leave them, no wonder lots of people end up in the hands of cowboys. I seem to recall the Corgi chap that fixed the cooker complained that most of the money went to Corgi for the admin & paperwork.
Alan
March 2008