No surprises. The response to my letter was 'unfortunately our decisions are final'. In other words - even if they screw up - there are two choices: the first is to roll over, the second is to make a formal complaint. Curiously, my complaint fulfils not one, but two of their criteria to consider a complaint. I have forwarded my letter, without amendment. I'm not holding my breath.
I have added links to a couple of other sites I visit regularly - The Cathedral of Shit, an enlightening and highly entertaining blog about the art world; this is tomorrow - an online contemporary art magazine with a daily review of an exhibition, and fundamental painting - a blog pretty much about what it says on the tin.