Thank you for the tip. it is definately something that i will consider once i see how often he will take from me, i need to up the size of rat again but might still hold off a while and just give him a slow stream of smaller ones.
another thing is that im not too bothered about how much i will spend on missed feeds, ive thrown away about 40 weeks worth of rats on his refusing so i think if i can even get him eating half a pack and half get thrown then that will be a win.