Stag Beetle Flying and CockChafer Beetle walking

Giant Stag beetles flying in London near Heathrow. We knew there were around and that they are only in the South East of England and so we created habitat for them. Now, some years later the results are truly wonderful to see. Massive 70mm long Stag Beetles flying near London. See we don’t just have Heathrow and planes. But please let me know what species it is as there are hundreds of different species. Just go an email from Russ saying the Brown one is the Cockchafer Beetle. Thanks, Mike.