I've found Starbucks to be the best so far with their wifi strength. McDonalds come a close 2nd. Burger King seem to be bottom of the list in my experience.

Anybody here agree/disagree?

By the way, I never eat at any of these fast food outlets - just a cup of tea, chair and table and I'm happy

I like Pret and Starbucks. But I do get irritated by people buying ONE CUP OF COFFEE and hogging a table all day.