I don’t understand why you are making out that they’ve gone above and beyond by picking up the phone and arranging an RMA for a cpu
Because IME that is rare in this sector. I don't know why - I can guess, but it would be just that, a guess. Allegedly one of OCUK's competitors had a whole team dedicated to putting off customer returns. I once purchased a stack of faulty blank DVDs from one of OCUK's competitors in Luton. When I went to return them, I was refused a refund and there were over 100 people in the queues; I never purchased from there again. I could go on.