Thanks for the reply,
That is what i have been doing if they land on the roof they miss a feed. For the last fortnight, i have trained them daily/fed on return and this has been thier only excercise. Today it was misty, so i let them out instead. After 10 minutes, they were straight on the roof again. I am wondering if it could be they are lacking something in thier diet or it is a sign that they are sickening for something.
YIS Gary