Hello. Maybe Oil Beetles are staging a revival! My wife and I saw this one by the estuary of the River Dart (S. Devon) on 4th May 2011.
It must have been 4 - 5 cm long and beautifully iridescent.
Wanted to report this to the 'ongoing survey'. Unfortunately, your link/URL did not function. Any further information available?
There's an extra http:// at the start of the link.
Try this one instead: