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The pattern was stronger than it appears in the photo (light was fading) having googled the two species I would lean towards C. corticalis but is there a defining feature that I may have observed but been unable to capture in the photo?
Not that I'm aware of, although if it was found indoors I think it's more likely to be corticalis. For an ID I'd have to look at an adult under the microscope - though others may know of some pointers?
Wasn't indoors but in a bush by the side of the house. Thanks for your help - I'll have to catch another and have a closer look. :)
Lat/Lng: 51.5808, -2.8107
OS grid ref: ST439871