The Japanese Rose (Rosa rugosa) is considered an invasive threat in some regions. It is commonly planted in gardens and verges but it has become naturalised in many places on the coast according to the excellent book Field Guide to Coastal Wildflowers of Britain, Ireland and Northwest Europe by Paul Sterry and Andrew Cleave.
Jessica's Nature Blog 
There are some of these on the Erme estuary in Devon, I am not sure how they got there but they seem very happy. [Sorry to be slow to comment but I hae been experiencing WordPress problems]
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Thank you, Philip. I hope your WordPress problems are solved now. It is so frustrating when things go wrong.
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