Thanks Mosquito, it could be Alsterfors - there's quite a lot of them about, it'd be nice to find one with a label, maybe 'Made in Sweden' was all the British buying public required, or the exporter/importer only needed that.
Leni, yours is a very similar beast, and one I've seen before too. Yours has horizontal ribs, but mine doesn't...my one has a slightly uneven (but deliberate) appearance that makes it look like it might have those ribs. I'll remember to keep a lookout in future for some more information.