I did my 30 hour PPL in the summer of 1964 at the Wiltshire Aero Club / Flying School at Thruxton Airfield.
Six Jackeroos, and 2 or more Piper Colts, all non-radio, all training, near to Middle Wallop where the Army Air Core trained on Austers. No Air Traffic service of any kind, as the tower was offices. No light signals. Just the Signal Square and windsock.
When flying you almost always had other aircraft in sight, so your brain knew what to look for.