I'm now post travel, so that's not an issue.

Customer Relations have just come back to me saying no downgrade compensation is due since the downgrade resulted from a change of aircraft rather than an oversale, and I was informed more than 14 days in advance. I didn't think either of those factors was relevant to the situation, but perhaps I'm wrong? Having had a look through the thread another poster kindly suggested I'm still not entirely sure where the truth lies.