In message , Andrew Gabriel writes
I find that in hotels, razor plugs are often a sloppy fit in shaver 240V sockets (possibly as a result of frequent use by heavy-handed customers), and tend to fall out. The fit in the 120V pair of holes is usually firmer (presumably because one has had much less wear and tear).
The only UK 13A 3-pin male to 2-hole female adapter that I've ever found to provide a really good fit for the plug of any razor I've had was supplied with a cheap Chinese amateur radio hand-held two-way radio (for its wide voltage range, wall wart charger, which has USA blades as pins).