Ok, I'll give him a few days to try and figure it out! He does go past it quite a bit so when the hunger strikes (I'm hoping everyone knows the shreddies ad for that link) that he'll get the hint!
Well, I thought I'd give an update. No joy regardless of the cup/trough/etc used, he just doesn't want to go near them. Only just about takes waxies out of it! Just gonna have to let them roam and think of a way to stop them hiding too well! Cheers for all the suggestions though!