Back from the vets, nothing major to report - he thinks that Trapper's behaviour is most likely due to his heart beating more slowly at times, which then reduces the oxygen to the his brain.
I've also just been speaking to UCD vet school, and when the time comes, they would be happy to have Trapper's body, which they would use for both teaching purposes and research in the pathology labs. This is something I need to discuss more with the family to be sure everyone is ok with it. In theory I'm keen to do this, in practice I hope so too.
MVD and CHF is such a long hard battle for our dogs, thank goodness cavaliers have such happy personalities and just get on with it - as has been said before, they don't know they are sick. Every time I take Bosco out for his walk I feel so guilty leaving Trapper behind