To set camber you will need the bolts as said above, and as you said the rears are not normally adjustable. If you want to get shims I would suggest you get a 10 minute shim for the rear left to bring it to -1° and get a 30 minute shim with the wider end at the top to bring the -1°24' back to just under -1° (-0°54') so they are about the same.
I've just had my full alignment done on Wednesday and had the camber of the fronts (with the correction bolts fitted) to -1°30' i.e -1.5°. Seems to be spot on in my opinion.
I am having PE2's fitted soon. 205/45/16. I would prefer a car which can corner well.
I dont know how much its lowered, but the car is on coilovers, i cannot adjust camber. I have had the toe setup. I will take your advice and have 1° on the rear.
My current camber is;
+0°27' front left
+0°05' front right
-0°50' rear left
-1°24' rear right
I need to have this setup however i must buy bolts for the front and shims for the rear.
i would suggest the difference he has at the moment is down to a worn wheel bearing, i'd replace that first and check again