I just had a phone call from Peterborough Video Service to say that they have spoken to Pioneer, but that Pioneer are saying it is a characteristic of the set, not a fault. Big surprise. I told PVS that I couldn't care tuppence what Pioneer say as my contract is still with PRC. An engineer (two, actually) saw the fault and agreed it was distracting. I've asked PVS to send me a copy of the report the engineers made, and to send one to PRC also. Even if they aren't allowed to call it "faulty", anything which proves that it is flawed and therefore not of satisfactory quality will be enough to force PRC to give me a refund.
If they still don't, they will be breaking the law.