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The pictures are a bit blurry, and most show the wrong side of the shell, so I can't be certain they are canas, but I can be relatively sure they aren't brigs. There are several other species besides canas that sometimes show up in the pet trade. I'm not sure which of those might be available in the UK. Brigs are one of the very few species that don't eat plants. Canas aren't even that voracious compared to some other species, so you can be pretty sure these guys are going to tear your tank up.
Hope that helps.Possibly, the truest test of one's capacity for compassion, is whether one can love a snail.