Hey burnttoast,
A really good choice to get a 480 instead of a corsa!
That ones been for sale for ages. At 4k it's top money for a 480. It looks to be in good condition, apart from the rear wheel arches which are still reasonable, but starting to go.
I guess as it's from a dealer it will come with a warranty, at least 3 months (try to get 1 year by haggling). As they've had it for a long time they may accept a cheeky bid
If you didn't want to shell out 4k, there are a few cars for sale a lot cheaper, look on eBay and the 480uk Facebook page.
Depends on what you want I guess, I'd say buy the best condition one you can afford. They all have issues of some sort, but usually are reasonably easy to fix with a bit of searching for info on here or on the FB page.
Things to check.
When was cam belt last changed. This should be every 4 years or 60k miles
Does info centre function correctly
Does Speedo and odometer work ok.
Do pop up headlights pop up quickly and smoothly
What are door bottoms, sills, boot floor in spare wheel well and wheel arches like, check for rust.
Rear lights can fade and or crack. New are available but not cheap.
Same for front DRL and indicators.
Is there water ingress at rear, usually getting in through rear lights, rear side marker or cables to rear window and wiper where they cross from body to boot lid. Easily fixable.
Does it idle ok, and accelerate smoothly.
All gears ok, no crunching etc...
Good luck in your search.