Replaced the bulb in the DSTC switch today - annoyingly I could only source it from Volvo despite ordering very similar looking bulbs on eBay and trying a local motorfactors, still, at least its sorted.
I also replaced the locking fuel filler flap solenoid as my old one had stripped some teeth on the internal cog, most likely due to a failed hinge at some point.
And I'm pleased to say I now have no more niggles!! I just need to replace my engine mounts (on order) and sort cosmetics and I'll have a perfect old V70.