A couple of stonking males Stag Beetles. First one located in flight as it flew towards a Hawthorn tree, nearly knocking it over in the process.
Thought that one of the beetles uncovered was a female Lesser Stag Beetle - but now not so sure. Comments appreciated. As for the other two beasties - guess I'll just have to wait till Lee Gregory has a view of these pages and can send some identification suggestions through.