Here are a selection of links to related sites, organisations and other local Green Gym groups:
BTCV homepage
Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust (BBOWT)
Abingdon Naturalists Society
Oxford Preservation Trust
Natural England
Abingdon Town Council
Vale of the White Horse District Council (VWHDC)
Royal Horticultural Society information page on Himalayan Balsam
Wallingford Green Gym
Sonning Common Green Gym
Bicester Green Gym
Woodstock and Chipping Norton Green Gym