Thanks, af, I hadn't used that wording on google. Still none within less than an hour's drive of us but will definitely try Bide-a-wee once it opens this weekend, as it's an RHS partner garden, and I visited Longframlington a couple of weeks ago before they had much stock in. Much as I love living in Berwick-upon-Tweed, I've discovered that most things are at least an hour's drive away!(except the beautiful coast and the silvery Tweed!)
Deb, I'll have a look at Parker's- thanks!