Thanks Trigon - oh dear, it's back to the Remedial Class for me!!!!
I note that
"The resistor from pin 11 doesn't appear connected at the left hand end" and
"One end of the cap isn't connected at all" - I'm assuming that this is one and the same missing link on the Breadboard?
"The crystal appears to be connected across the trimmer" - I'll look more closely at this but my understanding(!) is that only two tabs on the trimmer need to be connected - one of the outer tabs and the central tab?
As for the +ve and -ve rails hopefully I've got that right where the red denotes the positive (+) terminal, and black denotes the negative (-) terminal on the battery. I changed this slightly and had the red (+) terminal going straight to Pin 16 (Vdd). Nothing else on the board needs power.
The HEF4060B was running very hot so what are the chances it is fried?