With much of the site under construction or stripped down, the visit involves a bird's-eye view from the ArcelorMittal Orbit tower which stands next to the Olympic Stadium.

BBC: London Olympic Park opens for visitor tours

To become a bird ringer in your area visit the BTO website to find out where your nearest ringing trainer.

BBC: Cambridgeshire - Autumnwatch: Get closer to nature

Although bird enthusiasts from both countries visit during the summer months, Canada has a more noticeable presence on the island.

ECONOMIST: An international grey area