Thanks to everyone who gave advice and especially oldguy who gave me the link to youtube which gave me the idea, I'm glad to tell you I've managed to trap all the awol pigeons. It took a few amendments to the trap but a picture of the succesful version is attached. I wire meshed it a quater of the way down and sat a couple of decoy birds in there, then placed some seed on the floor in the open end and sat the trap on top of my garage in full view from all the neighbors roofs. Attached some cotten to the wooden door and sat in the bedroom watching untill they went to feed on the seed. Pulled the cotten and hey presto, captured birds.
I have cleared a lot of the branches away from around the loft making it a lot lighter and visible as a few of you suggested(picture attached).
Can anyone give me some advice on training birds that have been out for 5 consecutive nights and seemed quite happy to carry on, plus my birds that stayed havent been out for 2 nights as i thought they might join the loose ones as the flew overhead. Any advice would be gratly appreciated as letting them out again is a bit of a worry.