What is this called: British oven pot holders connected by towel
Solution 1:
I think they are just called double oven mitts. See photo here: https://food52.com/shop/products/82-double-oven-mitt
Solution 2:
To simply answer your questions, here in the UK they are simply referred to as oven gloves but I feel that is more of a general term for cloth designed to be used to hold hot pots.