In the end, used and modified code from this project. I just needed to modify it to include daylight savings time and change the colour scheme. Wasted a bit of time remembering what needed to be connected where.

Want to add :-

- a light dependant resistor to adapt LED brightness to the ambient lighting

- a passive infrared sensor  to reduce overall power consumption, by switching off LEDs when nobody's around.

I didn't have the requisite parts to could move forward on these aspects, but I'm really happy I got the light clock elements working. As it stands, I could be content with the circuit and code in their current state, as they are minimally functional.

Moved onto the stargate clock face design, and managed to get to something decent, that should be the right size: 60 symbols that should line up witht he 60 LEDs from the link. Mostly need to decide what will be scored / engraved on this design.