Of course this one may not be British, so it can be moved if thought best. I wondered if the Star of David (in relief on the bottom of the inside) might indicate some connection with Roy's LUSHUS mould which has a similar motif in the shape of the mould, but only guessing and probably unrelated entirely.
No other marks or words at all, and about 5.5" (140 mm) in diameter, with some wear but not very old I don't think.
Presumably these things are pressed in one piece moulds ?? - certainly can't find any seams.