This is a rubbish photo but it was very difficult to get a good picture of this little fellow who was flitting about in the reeds by the main lake. He was singing away too. I'm not sure whether it is a willow or reed warbler but I think it is one of them. If anyone knows, please tell me. I haven't seen one of these before either so I will be able to tick it off my list. I am only posting this as a record of sighting him rather than photographic quality which is rubbish
Not a rubbish photo they are very hard birds to get good shots of trying to focus a subject in reeds, I would be inclined to say Reed Warbler. Have you listened to the songs of the two birds on the RSPB bird indentifier this should help.