Ringed Black-necked Grebe - the challenge

One of the Farmoor Res male birds has a large bright metal ring on its right leg. When it preens or dives the ring becomes visible. I am sure that the numerous Photographers might already have or be able to obtain enough of a freeze frame picture to ID the origin of the ring to a national ringing Scheme at the very least. Possibly even get enough of the number/code to ID the actual individual bird/ringing location. This presumably will be the nesting site as I would assume they are mainly ringed as 'pullus' on the nest (cannot imagine many are caught in mist nets!). So is the bird Scottish, Swedish or another ? who knows....