So it happened again this morning, the dash lights definitely dim when i turn the key.
During this time i tried a few things:
Jiggling the key in the start position Running extra earth wires from the alternatorStriking the starter solenoid whilst i had someone hold the key in the start position.
None of this worked, so i walked away from it for 5 mins and it started perfectly when i came back. It relaly likes having these mood swings these days :-/
Not sure how else to approach this issue now :(