Bob Leakey was involved in many of the explorations in the Lancaster Hole - Ease Gill Caverns system, and was perturbed by the damage done to the floors and formations. As a consequence, in 1952 he established the Cave Preservation Society - a national organisation dedicated to looking after our caves. It was only active for four years, but in that time was involved with taping routes through caves, clearing rubbish from caves, advising on digs, producing a cave preservation code, writing articles in caving magazines, and lobbying planning departments.
The British Caving Library has the CPS archive, and will, no doubt, be able to get you a copy of the cave preservation code.