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Thanks everyone. I am buying them from David Austin. I asked for their advice and I am buying 2 Zepherine Drouhin (thornless) for an archway at the back. It is the front I am concerned about. They have suggested Magic Carpet, which is a ground cover and has a strong scent, but it has thorns. I want it to grow along the top of a short wall, about 2 feet high, and to droop down the sides. There is a piece of grass belonging to the council, between my garden and the path, so I suppose that might be a small deterrent. I think I will probably chance it. Thanks for your help everyone.