Malcolm,
Your £1000 is about right for a good job on an otherwise sound car
The problem with almost all old cars is that when you start rubbing its never quite as sound as you thought. A tiny mark turns into a hole. You can't paint holes or rust... it just goes on and you end up in tears...
Best thing if you possibly can is prep it yourself and get a good painter to do the final prep and paint. Not all will do this as then your own work will largely govern the finish.
Have a look at my van pictures. We did ALL the prep, my friend Rob is a time served body man (40 years in the trade) and a top-notch painter finished it off. It cost us 100 hours EACH and £200 for the painter (he literally just sprayed the topcoat - we even masked it up). We have to fill some dents, there was a small amount of rust on the front wing joins. Cost for this standard job from start to finish would be nearer £2k.
I have another man who I nearly gave the job to who works from home and would have charged £300. It would NOT have looked like it does now.
You really do get what you put in or what you pay someone to put in. I can think of little else as true as body painitng for this maxim.
Charliemouse.