This is some sort of warbler and looks like a reed warbler but they are only summer visitors so it can't be that. Anyway, he was only about the size of a 50p piece and kept flitting about in the undergrowth and didn't seem bothered that I stood there taking pics of him. At times he was only about 3ft away from me! I got some shots of him in flight with his little wings out so I might post one another day especially if it rains and I can't get out! In this pic, he decided to stand still for a second in the sunshine.
I will google and see if I can identify him as the RSPB bird identifier isn't very reliable for some reason as he definitely looks like a reed warbler from the book but can't be. If anyone know what type he is, please let me know