The U3A has published a number of interest group start up leaflets designed to help you get your group up and running:

Archaeology
Architecture
Astronomy
Canals & Inland Waterways
Debating and Speaking
Drama Theatre
Environmental Studies
Family History
Folk Dancing
Food
Gardening
Geology
Humour
Jazz
Languages
Living History
Local History
Sci Tech
Storytelling
Textile Crafts
Walking