Not used them in UK but in France you can usually get a signal if you are parked close in the carpark .When connected you get a free login page and away you go. Then you don't have to drink that awful coffee.
This site Mcdonnalds WIFI gives locations and you can get them in POI format for your navigator somewhere.
This site Mcdonnalds WIFI gives locations and you can get them in POI format for your navigator somewhere.