My case for compensation fell on deaf ears. The first response was standard 'boiler plate' paragraphs not answering the questions (as reported earlier in the Thread). The 2nd response at least looked like the CS rep had read my email, but did not address all the issues. Their third and 'final response' suggested that I should contact CEDR if I was not happy with the response (see extract below)

"Our final response
I’m sorry to hear you’re still unhappy with how we’ve dealt with your complaint.
I’ve thoroughly reviewed all the information you’ve sent us, and I can confirm that we believe we’ve dealt with your case fairly and appropriately. We’re unable to respond to any further requests for a refund.
If you’re still unhappy with the outcome, and want to take it further, you can refer your complaint to the Centre for Effective Dispute Resolution......"

Clearly I am not going to waste my time or CEDR by following up. But, as other posters above have said, this approach to fleecing Club Europe passengers on BACityflyer is a real blot on what is otherwise an excellent airline. Downgrading what is already a downgraded product really confirms to me that Club Europe is not a premium product worthy of the premium price charged on BACityflyer. However, if there are people mug enough to pay the excess price for this so called 'enhanced and premium' service, then I guess BA will not wish to stem the flow of this revenue. I for one will be very hard to be persuaded that Club Europe out of LCY is worth even a few £s more than Y class.