I'm going to change my mind, and suggest these are handled jellies, rather than custards.

.............. and the reason, you ask?
Whilst it's true that custards are far more likely to have handles, they are in the main shorter in the body, whereas the length of body of these examples is more in keeping with the size of jellies - so perhaps a tad more interesting, and uncommon as 'jellies with handles'.
No doubt though that custards and jellies were quite possibly interchangeable in actual use.
The difference between the two types of glasses can be seen clearly in S. & F. - a very useful book and very helpful when looking for shapes and names of much Victorian glass.
I had meant to ask what was the significance of "they feel like English glass" - perhaps I've missed something here, or just that I'm not a touchy feely enough sort of person

I assume the 'tiny circles' are those small wheel engraved oval shapes under the foot - simply decoration (a not uncommon feature under feet in second half C19), and nothing to do with telling us anything about the maker, unfortunately. But again, nice pieces, so good find.