There is a community based project called Timebuilders in Sheffield who provide daily conversational english classes to a wide range of people - it's a really friendly bunch. I used to volunteer down there.
They run out of St Mary's Church on Brammall Lane every day from 10 am to 12 noon and accommodate all levels.
They have a website or alternatively you can contact Aroose on firstname.lastname@example.org
/ 0114 2230240.