There's a long history of Polo being played in the Cotswolds, both at Westonbirt and Cirencester. The Beaufort Polo Club play regularly at Westonbirt and the Cirencester Park Polo Club (the oldest in Britain) also host regular matches. Royals, including both Princes William and Harry are regularly seen spectating - and playing - at local Polo matches.
 
Membership to Cirencester Park Polo Club costs from £23 per year, while membership to the Beaufort Polo Club costs from £60 per year. Both clubs admit non-members to many matches.
 
Websites:
Beaufort Polo Club
Cirencester Polo Club