Originally Posted by
BobServant
Finally, am I right in thinking CEDR would be a claim for the Avios and MCOL my claim would be for the cost of replacing the Avios at current prices...
It's very difficult to say without some more specifics: was this a downgrade at the departure gate, or a downgrade with an equipment change or a downgrade due to a missed connection or a downgrade on a non European sector, to give some examples.
Broadly speaking you are currently best to go via MCOL, but again that's advice which is as broad as it is long, individual circumstances may make CEDR better.