In answer to my own question...
AQV18PSLN
12 40 50 42 66 73 50 07 26 00

AQV24PSLN
12 40 50 42 66 74 10 07 26 00

Why are these codes so hard to find? Is it sheer arrogance on the part of Samsung? My biggest memory of having a Samsung A/C fitted will be the fact that I spent the first weekend, (and it was very hot & humid), with a non-functioning unit simply because I could not find the option code needed to reset it. And why did it not work out of the box anyway?