7 days and 7 coats of paint later, including several washes and some sponging, I think the salon walls are pretty much as they need to be although I might try an almost transparent wash of gloss medium and light green to counter the slightly too flat/chalky finish. The variations are fairly subtle so I hope you can see they actually are there, but then that is the idea really, if they were too obvious I would have totally failed. It should look aged but not like several different painters, all with different paint post, have been let loose after entirely too much red wine!
Next step is reconstructing the room and decorating it - yay! the fun bit at last - I can get all sorts of delicious bits and pieces out of their boxes and into their 'home'.