When we stayed there, there was a hourerly weekday bus service but that might have changed? Its not far from the site to the town. If you are going to rely on a taxi it might be worth giving the site a ring to check there are local taxi firms available. If there is a taxi firm in Chipping Norton I would have thought about £10 one way?
Might be worth getting the Uber App installed on your phone as a local cab company might use it and you will get pricing information before you commit.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets