Well sorted it today.
What a mission, we swapped the bulbs as said tested the lights with meter and all looked ok from what we could tell, ordered a switch and then as the switch turned up we saw another
Corsa same model / Year brake lights not as in the manual and online.
So popped them back out went and bought some "fog light bulbs" bingo worked a treat.
So Halfords / local motor factors / online and a corsa forum all say we need 382 bulbs which are for lights and braking, yet my mates are the fog lights :confused:.