There's an excellent little book about Scottish samplers by Rebecca Quinton, the curator of costumes and textiles for Glasgow museums. It's called Patterns of Childhood. - specifically about the samplers from Glasgow Museums - and what very interesting samplers they are.
In fact Glasgow and its surrounding area is full of interest for textile devotees - visit The Burrell Collection for tapestries, and Jacobean raised work, as well as fascinating costumes. Go to the Kelvingrove Museum for some wonderful embroidery by Margaret MacDonald (Charles Rennie Mackintosh's wife). Paisley has a museum stuffed with shawls. And if you want to go a little further afield, to Shambellie House outside Dumfries, you'll find a whole enchanting costume collection.