I wouldn't bother with the brakes, the standard items are fine. Also, on the one Evo rollered, that had the VXR Performance Centre remap and the exhaust - and it made 223bhp.
Now, Regal can remap them alone for less than £500 to 230bhp. I know the VXRp one keeps your warranty, but Regal's warranty covers anything that breaks as a proven result of the remap. And if it's not proven, then it's covered under your VX warranty.
Although of course, to save hassle, a savvy customer might have the remap removed by Regal (all the top tuners will put you back to stock as they save your original, manufacturers map) then take the car for warranty work, then when fixed, pay the small fee to have your remap put back on
I still don't think that £23k Corsa is gonna make 260bhp though hehe! And everywhere recommends, if you speak to them, having at least 1,000 miles on the car so it's well run in first - he seems to be just having all banged on a brand new car.