Hey Simon..
I'm a few minutes from there.

I've tried a whole bunch of stuff with no luck.
The Auto Electrician is dropping by in the morning thankfully.

Problem resolved..
It was a loose contact on the cable that sits under the main wire coming from the battery on the starter motor.
The cable looked like it was rusted in place.. That combined with a temperamental wiring plug under the ignition.
It had probably been disrupted during the alternator work, new relay and coil wiring.
Thanks for everyone's input and a huge shoutout to Melita Auto Repairs in Newport for making a home visit.
Saved me a tow and a lot of stress!!!!

Cheers.