I think it may be a newly emerged damsel, which it yet to "colour up". If you can describe the environment a bit, and whereabouts you saw it, several could be eliminated, but I don't think a definite ID will be possible... but others more experienced than me may be able to
Thanks. Doing a bit of research before posting i also thought it might be a newly emerged youngster but wasn’t sure. The image was taken at the South Solway Mosses in north Cumbria. There were lots like this one flying around. Cheers, Steve