During the winter (from the beginning of October to the end of May), we meet on Sundays 10am-12pm at the White Hill Centre, Chesham, Bucks.
  From the beginning of June to the end of September, we meet at Newlands Park College, Gorelands Lane, Chalfont St Giles, Bucks.

The following map of the White Hill Centre has come from www.streetmap.co.uk:


And a map of Newlands Park College, also from www.streetmap.co.uk: