Riverdown,
You will see that I have posted much earlier on this messageboard some information about the Lovat Scouts. In my opinion, they ought to be included as a category on this site, but the moderator thought not. I think from what I know that they were one of the most highly trained and specialist units in the British Army, certainly they ought to be included alongside PPA.
All I know about Greece was that they were witness to a number of terrible atrocities (I heard about heads on spikes outside villages, and buckets full of eyeballs, gouging was apparently a particular favourite), and helped train the Nationalist forces, in particular the Greek Mountain Brigades and their Commando forces, alongside the SAS. Officially, British soldiers were not involved in fighting the Communists, but it is clear that specialist units like the SAS, SRS and Lovats were all involved in active duty after the end of the second war and during the communist insurgency. I also know that British military involvement in Communist insurgency in the Balkans at the end of the war went well beyond Greece: my relative was particularly emotional when he talked about having to kill the very people we had fought alongside, such as Tito's fighters. British forces were involved in Albania and Yugoslavia chasing communist insurgents beyond the Greek and Macedonian borders.
Of course, the files on these actions remain closed, well beyond most other files of the period, and those involved remain sworn to secrecy.
I would love to see