When you search for a location, Google will search for venues from the centre of that area. For example, if you type in Manchester then click search, it will search within 5km of the centre of Manchester. You would need to increase the radius to find places outside of the inner city centre, or be more specific with where you are searching.
Although there are now lots of Chatter & Natter tables, there are still lots of parts of the UK with no venues involved. If you think your local café or another venue with a seating area might be interested in offering a Chatter & Natter table, please ask them to contact Jenny, or register online.