The 1st UK issue of Arthur Smith's "Guitar Boogie" was over a year earlier on the UK-pressed MGM 3011 as part of an international series which could be bought in the UK by special order; it was coupled with "Boomerang". See my comment on MGM 220.
UK MGM, like HMV, Columbia & Parlophone, had an international series which could be purchased by special order from UK record shops, and MGM 3011 is a UK-pressed release on it, coupling "Guitar Boogie" with "Boomerang". There are 39 known releases in the MGM 3000 78 rpm series, issued between late 1948 and the Summer of 1952 (there may be later issues). MGM 3037 is also by Arthur Smith, "Mandolin Boogie" c/w "Rhumba Boogie". There are 12 known issues by Billy Eckstine. Clearly the disc shown in the YouTube vid shows a copy of MGM 3011 made in Holland, possibly because trade barriers in The Netherlands at the time meant UK pressings could not be imported there; there is also a New Zealand pressed MGM 3011 on this site. And discogs has pictures of the Dutch, New Zealand AND UK-pressed disc - https://www.discogs.com/Arthur-Guitar-Boogie-Smith-And-His-Cracker-Jacks-Guitar-Boogie-Boomerang/release/11010184. The only person I know who has a listing is Paul Pelletier, who gave me the above information but hasn't revealed the full list. Anyway, this site needs to add MGM 3011 to the UK list, it has been verified.
The "interesting site" Link given below about late London 78s appears to have been written in 2011 and relies on information given in the Record Information Services London singles catalogue by Paul Pelletier published in 1982. I note that the RIS website has recently updated information on the late London 78s, http://www.record-information-services.info/corrections/london_additions.html, and concludes that this Eddie Cochran coupling was NOT issued as a 78, along with several others previously thought to be so in that 1982 publication (and which, incidentally, the website says has just been reprinted because of demand).
As far as the rarity of late UK London 78s is concerned, apart from the obvious breakage factor and probably relatively small batches pressed, UK collectors overlook the fact that UK London pressings were exported to various other countries (hence the variable 3rd letter on the HL catalogue number prefix) and it may well be that the late UK-pressed London 78s were primarily for export, although made available to UK record shops if ordered. By 1960, 78s were associated with people living in areas without an electricity supply and thus relying on wind-up gramophones, and if UK-pressed late London 78s were ending up in such "primitive" places mostly overseas, then no surprise they cannot be easily found, if at all, in the UK. I have contacted the RIS website and asked if they have any idea to what countries London records were exported, I have been told to expect a list, circa 1960, to appear on the London Corrections page shortly, which may give serious collectors some holiday ideas.