Northumberland,
United Kingdom 
ID please, thought I'd posted this yesterday but can't see it anywhere. Lovely rose like flower growing wild on the Isle of Arran :-)
21 May, 2012
Answers
I agree Bulbaholic.
Although it did cross my mind that it might be -
Rosa spinossima 'Dunwich Rose'.
21 May, 2012
Our dog roses are all pink, Bulbaholic. I wondered if it was a Burnet rose, Rosa pimpernellifolia.
http://en.wikipedia.org/wiki/Rosa_pimpinellifolia
21 May, 2012
Hi bulbaholic/fractal cat and beattie - I thought it looked like a dog rose too but have only ever seen them in pink. Will check out your suggestions on the RHS site and Wiki.
21 May, 2012
Just checked out and think might be the Burnet Rose, also known as the Scotch rose apparently and quite common in coastal areas! Thanks everyone :-)
21 May, 2012
:-)
22 May, 2012
This looks like the native Dog Rose, Rosa canina, Julie.
21 May, 2012