Just a note to say I have found the fault with the 4011 replacement: I tested all 14 pins on the IC socket after removing the chip and.. one of the pins does not beep on the meter.. how can an IC socket not have continuity from top to bottom?

Anyway, it doesn’t, so I need another socket.
Maplins in Middlesbrough is still trading, so I’ll give them a try..

This message was sent from my phone. Please excuse the brevity and any typos. Thanks