FEED TIN.Nothing in it untill they do what you want them to.When you feed them make a fuss of them,if you whistle to get them in whistle when you feed them,use a bright coloured container to feed them,if you hopper feed use the contaner to fill the hopper,sit in the loft with them when you feed them,do not over feed,watch them ,when they start going to the water stop the feed.Once you've got control of them start to up the feed,any fools after that nothing to eat.
Lindsay