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I was chatting to a lady in the village today, who owns the flower shop. She showed me a caterpillar on her baskets. I came home & googled it. It looked like the brown tail moth caterpillar to me. Any ideas what she should do about it please. She said there were hundreds of them at the side of the shop. Can they damage her plants if they get in the shop.

Janet,
This may help with the answer.
http://www.dailymail.co.uk/sciencetech/article-1189685/Plague-hairy-caterpillars-cause-rashes-headaches-breathing-problems-invades-Britain.html

Thanks Landimad. I've emailed the link to her so she can make sure it's the same one.