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Could it be Uncertain?
In time-honoured fashion, it could be Uncertain, but I'm not sure ... the Rustic is very similar, and it's always hard to judge between the two especially from photos, which don't show the texture of the wings and don't always show the true colours.
These photos do look a better match for Uncertain than for Rustic but I'm not sure enough to confirm it.
Entomologist and biological recorder
Thank you for your comments, I'll record this as Hoplodrina sp. then.
Lat/Lng: 50.9, -0.2
OS grid ref: TQ3119