They sell gluten for bread making at lakeland.co.uk but the blurb says it's not suitable for breadmakers. 

I've been making bread for over 40 years and have never added gluten to the rest of the ingredients regardless of the method used.

We've recently been given a bread maker and it produces a surprisingly good loaf but I still enjoy making bread by hand (using fresh yeast whenever it's available).  Kneading the dough is a great stressbuster!!!