In article ,
David W.E. Roberts wrote:
Looked in Maplins but can't find a 240v LED - although most don't seem to
have a voltage rating.

That's because an LED is a DC current operated device. For normal DC
operation they require a series resistor the value of which depends on the
voltage it's running off and the current you wish to drive it with. For AC
use, you require a diode as well.

It's more normal to use a neon indicator, but if you'd prefer the look of
an LED it's easy enough if you can solder.

I *think* RS components do mains LED indicators ready made - they
certainly exist, I've got some.

--
*Change is inevitable, except from a vending machine.

Dave Plowman London SW 12
RIP Acorn