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Thanks to Chris and Ruud both.
Oops! [red faced with embarressment] that's my sloppy deductions - I just looked at the distinctive antennae and jumped to the wrong conclusions.
Given that Choerades gilva is presumed extinct in the UK I assume it must be C. marginata. I have another [poor] shot which is head-on showing the white band of hairs below the antennae. Red Lodge Wood, or at least that part of it, is Oak woodland with the rest being 30-40 year old conifer plantation.
And thanks Chris for getting my pic visable - not sure what I wasn't doing right? If this one doesn't work perhaps you can fix it too...