Jon.
I can type with the caps lock off and I can change Baxi fans.
What I was trying to point out to you was, if you read the instructions the job is so easy. You seem to be making a mountain out of 5 screws.
The row of screws on top of the plate do not have to be removed.
Surprise surprise it all comes out as one piece then undo the fan screws as per page 40 if you bothered to read it and look at the pictures.
So you will not need the sealer from Baxi. (I would see If I could get a refund).
Perhaps you should have asked the Corgi engineer if he had any knowledge of the boiler when you phoned him.
If he took longer than =BC of an hour to change the fan he should be ashamed of him self.
If you had read my post you would have got enough information to do the job, but no you read it the same way as page 40 of the instructions and did not realise I told you how to do the job.
As a corgi engineer who has changed several of these fans all I can say is: 2screws 4clips 1 harness 2 pipes and 3screws. Reassemble in reverse order.
Do not touch the 5 screws.
It is so easy can you now see why I shouted.
David.