Thanks Anne, that's another site to add to my favourites.
The reason I ask is that I have somewhere (though God knows exactly where!!) a pretty little bowl with incised marks on the bottom 'Collis (or Collie) Pottery Ontario Canada. The bowl is beautifully glazed in a rich, glossy blue, a little darker than the usual Anglia Pottery glaze but nowhere as green as BMP. When I find it I'll post it up. I did have my entire collection pictured and filed on my old pc, but one day it did a Richard Hammond and crashed badly, losing everything in its memory. Unlike Hammond, its memory was irretrievable