On Tue, 2 Jul 2019 22:29:29 +0100, Steve Walker wrote:

Even so, until fairly recently, multi-ways were wide enough to prevent
this.

Nope, have several old, as in 1980's vintage, 4 way socket strips
where the plug will fully seat when inverted.

Also played with a variety of other sockets, wall and cable mounted.
On some the shutter on L & N is fully open with only the extra length
of the earth pin inserted.

--
Cheers
Dave.