Prob a bit late to reply to this now ... dunno how I missed it before! I have only claimed referral charges, unpaid items fees etc - no royalties at all - they didnt send any details as to how they had made their calculations tho so nowt to compare against!
Telling me to contact Sandy again about what they are not paying has just given me an idea how to approach my letter advising them that I still want this claim leaving open & on hold till the test case is decided tho so thanks!