Welcome Mark and thanks for posting on the forum with us.
I'm sorry to hear you're having some problems recording and watching 4HD. I'd certainly like to get this sorted.
I've managed to locate your account and run a few checks for you. There appears to be some levels which are out a bit which maybe the cause of this trouble. I'd like to arrange for an engineer of ours to come around and take a look at this for you. I will drop you a PM shortly (purple envelope top right) to discuss this further.