Tots bots are made in Scotland, Weenotions are made in Yorkshire (I think, definitely UK though), Lushious Little Somethings & Puddlekins are made in the UK. I'm sure there are lots more too. Someone else will probably know more than me
It's worth bearing in mind that not all the materials used in the production of UK made nappies are sourced from within the UK. Obviously it's nice to support UK businesses but if your main consideration in this article is for the environment then it's important to take this into account. How much environmental difference is there between importing the material and importing the finished product?