Thanks for the info. I haven't had any problems with the pellets falling out, if anything some are a squeeze to get in! I had a call from Armex today and the problem has hopefully been resolved. I was told that a fixing (I guess a screw/bolt) had worked loose allowing the indexing arm to flex away from the cassette.
Credit to the guys I have dealt with at Armex they have been very polite, helpful and quick to resolve the problem. Also got a free service and hassle free delivery back to me. Dissapointing that the gun had to go away but I've got mates who have spent £1100 on a Daystate only