Rod Speed wrote:

Tim Streater wrote
Tim Watts wrote

And in the old days, we mostly only had BC fittings to worry about...

Yes, what is it with this screw-in **** that seems to be creeping in?

Its basically a better design.

Unless you have metal casing forming the main socket screw thread, and you
use it in a country where polarity is not guaranteed - eg touching the lamp
neck (eg whilst unscrewing) gives you a shock.

Of course, modern designs use an insulating thread and a contact near the
base - but BC have never had this problem.

Occasionally, I have found ES resistant to unscrewing resulting in shearing
the bulb base.

--
Tim Watts