Clive-
Firstly, you'll need to forgive my ignorance of UK fishing terms. Doing a bit of internet research has led me to the conclusion that "course fishing" in the UK would likely be for be for carp. You don't mention what you will be flyfishing for. Is it still carp? If so, my suspicion is that a 7 weight rod might be too light. On the other hand, if your quarry will be trout in rivers, a 7 weight rod would likely be heavier than ideal.
Basically, what I'm getting at is, you will probably need to be more specific as to where you will be fishing (rivers or lakes), and the kind and size of fish you will be pursuing, in order to get any useful advise.
As far as a
Grays Platinum XD Rods are concerned, I have no specific knowledge, but assume it to be a quality rod, in that they seem to be made by (or associated with) Hardy reels.
As far as Orvis Battenkill Large Arbor reel is concerned, I actually have one on a 9 weight flyrod I use for salmon and steelhead, and can enthusiastically recommend it.