Hey all! Little update on how mines gone...
Took to Vauxhall Garage in Bolton and they said the diagnostic showed a rear left wheel sensor issue. They checked and couldn't see anything so had to remove the adblue tank to check the wiring all down the left side. Apparently they found a split in the cable so that had to be replaced and all the lights vanished. The lane assist came back to life, cruise control, hill assist etc. So good all!
Now 4 weeks later I've had the engine light come on saying "engine fault seek repair" and then 2 days later "emissions fault - car won't start in 700 miles"
So seems we've fixed one problem and potentially caused another by not re-fitting the adblue tank properly??
For those having all the warning lights, I'd highly recommend getting the wiring checked out as that seems to have put all the things that stopped working back to rights.