Britain and Irregular Warfare in the Past, Present and Future" by Andrew Mumford, University of Nottingham. Published by the US Army War College Strategic Studies Institute.

LINK

Do not believe this has been posted or discussed here. I note that, like some here including me, he believes mostly bad lessons derive from the Malayan experience.

I don't think he discussed one area of deficiency by the British that is not to some extent shared by the US. The problem in both nations is, I suspect, a combination of a risk averse political establishment (in total but party dependent with respect to bellicosity as the 'out' party will generally object to anything the government of the day decides... ) and an also risk averse and very bureaucratic military and Defence / Defense establishments (important distinction there, both the military folks and their civilian masters are at fault)...

Pity.