One of the members at Stratford GC pointed me to the Defford web site today site. Defford is marked on the 1/2 mill and is also known as Croft Farm. It is near the M5/M50 junction which is the Tewkesbury (TEW) BGA TP. Note that the strip is rather narrow for gliders (18M) and that they ask for a donation to a charity if you land there.
They run a webcam (WeatherJack's site labels it as Pershore). A particularly useful feature of this webcam is the ability to play a time-lapse movie of the day so far.