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The map shows this to be in the middle of Bristol, not Boscastle. Presumably a slip. The photo looks to be the same plant as shown previously for Boscastle, so I agree with Tim Rich's identification.
the daisy like flower was on the low cliff very close to the sea but not close enough to hit the tide
oh and thanks cicuta58 for pointing that out
Lat/Lng: 50.6917, -4.6984
OS grid ref: SX095914