Hi, and welcome to the club!
Wow, you certainly wouldn't lose that in a car park.
I've always wanted a Holden, superb looking machine and a sound to match the looks
That sounds more like either a loose connection or a Can-Bus fault.
I would start by doing a 'wiggle test' which is basically wiggling wires until you invoke the fault and the lights comes on
Start with the door wiring where it goes into the door from the pillar
Definitely sounds like turbo vairable vanes are gummed up with carbon
Try cleaning the turbo with this stuff and see if that makes a difference
Revive Turbo Cleaner Starter Kit Turbo Cleaner & Power Restorer 750ml (Diesel)
Hi.....welcome to the Club
Definitely keeping the love of Vauxhalls in the family and what a fabulous collection of Vauxhalls over the years.
Some interesting registration numbers as well
Feel free to post up some pics of the VX220 and the campervan if you wish
Good to have you onboard!