There are no shortage of errors in TCM theory and the Medical theories or explanations which surround Nei gong practices. The causes of these errors are, like most things, multifaceted.

Being in Australia, i have no real idea on who is available for that sort of learning over in the UK.

That is one of the other problems in researching this subject. Finding an instructor or mentor with the appropriate experience in the local area. as there are many people who will use the words "nei gong or nei kung" and mean Qi gong. these things are not interchangeable and While Nei gong may be a type of Chi gong it is not usually the case in reverse and while a Qi gong may be good for health to the point of even healing cancer. it is not the same thing as a complete system of inner development including herbal remedies and other deeper practices. Most people are forced to research and rely on books and video or move vast distances depending on the system.

And if we consider monastic systems such as dao dan pai or martial systems like Mo-pai or Bak fu pai Sun yi gong. where there are potential dangers associated with incorrect practice. the travel and appropriate experienced guidance is a necessity