I have never understood how it is still permitted to have a
lampholder like in the OP
http://www.toolstation.com/messages.html?closeUp=27046

The way the lampholder is suspended depends on the grip of the actual
screw-fittings on the bare wires.

If a moderately heavy lampshade is used then the whole thing seems to
be asking for trouble.

Does the US have ceiling pendant lampholders as dodgy as this?

There is so much safety in electrical products these days that I just
wonder how this sort of lampholder is not obliged to have a decent
flex grip in it.

Lampholders are the only electrical accessories where access to live
terminals without using tools is considered safe. Anybody know why?