This seems to be the most recent (and only?) SOE one in Theses Canada (from 1991), but I only did a very quick search:
http://amicus.collectionscanada.gc.ca/s4-bin/Main/ItemDisplay?l=0&l_ef_l=0&id=&v=1&lvl=2&coll=18&rt=1&itm=37682820&rsn=S_WWWkcaLmAedE&all=1&dt=+AW+|Special|+AND+|Operations|+AND+|Executive|+OR+AW+|SOE|&spi=-&rp=4&v=1
I believe this was published as a book as well (or at least someone published a book on SOE in Greece recently, using newly released files from Kew). Chris D. may recall others? Battleschool, you out there?
Maclaren talks about the SOE recruitment process (as does Foot of course) and both discuss how many were from the Dominions. A lot. Especially if you consider Scotland a Dominion as well... ;-)
As to newspapers, that is a Pandora's Box. Most state and provincial archives in North America (or local county or parish Record offices in the UK) have digital collections of "their" historical newspapers. A lot have not been digitized yet though due to lack of resources, and then you are stuck with old microfilm or microfiche (<shudder>) copies. US and Canadian National Archives also have digital versions of "national" papers, (whatever those were when there was no nation, say before 1867 in the Canadian sense), similarly TNA/PRO. Some major newspapers (Times of London and Globe and Mail, using the term loosely for the latter) also have their own paywall digital and searchable archives. If you have access to a good uni library you can usually get these for free as part of the uni online database collections, as well as things such as the British Newspaper Archive (part of the BL,
http://www.britishnewspaperarchive.co.uk/ ). Finally, London Gazette is online (
https://www.thegazette.co.uk/ )and it contains lots of pertinent Second World War goodies, if you know how and where to look for them... ;-)
Finally finally, most good public libraries often provide access to some of these resources online as well (as would Library of Congress I suspect?).
Hope this is useful.
Edit: PS Just don't touch the East Africa stuff in the Gazette or I will find you and break your fingers! ;-)