Miniature hedgehog family - Carlisle.

Extremely small. Bases range from 3/4 in to 3/8 in.

Bought them years ago thinking thay might be Briglin, but I'm sure
I've seen a much larger one somewhere, marked by MARC of Folkestone.

There is an image of a Marc hedgehog moneybox here: http://www.studiopottery.com/cgi-bin/pp.cgi?item=4305 and a large hedgehog jug here: https://www.20thcenturyforum.com/t14572-marcus-golberger-marc-prima-pottery-folkestone#128075
The clay looks right, and the moneybox is closest stylistically to yours but different enough to make it hard to attribute for sure.
Marc (Marcus Goldberger) retired 30 years ago which rules out asking him.

I think they may be Carlisle. They have the piggy nose and two nostrils

https://www.20thcenturyforum.com/t24562-carlisle-pottery-hedgehog-maker-i-d-help

Well spotted, I think you are right. The bases look similar, and too small to mark.

I have a list of looks similar to Briglin