If you take a current panel off the car (usually the fuel cap) you can get the different variations of that colour checked and pick the right shade.
Saying that the door, bonnet and bumper need blending is is utter crap tbh just get a good match.
You will need half a litre of base coat which is roughly £20 from paint shops
We charge £110 per panel. some say cheap some say expensive. we feel its the right money to get the job done right properly.
Think about it, primer £15, paint £20, Clear coat £15. thats £50 gone. some primer and clearcoat will remain for other bits and bobs but thats usually the way it works.
So when someone says they do it for £40 I dont understand how.
If you need any more information please just ask mate.
Nuno.