nice to see another clean example below the equator with the steering wheel on the "wrong" side
I can answer a few of your questions.
first of all, S823A Hot climate pack (as someone has already mentioned) is a low compression engine variant for tropical climate. the compression is 9.2:1 instead of the normal 10:1. You also have a high-flow tropical water pump fitted. Not sure what the exact power difference is though.
8. Upgrade the stereo system head , the original Blaupunkt has a dead display and the speakers may need to be replaced as well , I want something compatible with an iPhone or iPod , I will keep the original radio for future generations that may want to restore the car after I'm gone (I'm 50 now)
Stereo is a very subjective, opinion based thing but for what it's worth I have a Kenwood KDC X8016BT headunit. I like it because it has all the ipod/MP3/USB functionality, as well as bluetooth. also it is nice and plain black looking and best of all, all the displays are colour adjustable so the amber colour matches the rest of the cockpit illumination perfectly.
11. Find out why the Brake Lining warning is coming on (only when I turn the ignition on or off) , the PO 'said' he put new brake linings in.
The brake linings may well have been replaced. there is a little sensor which needs to be replaced along with them (if they were low enough to activate it. There's one in the front: 34 35 1 180 432 and one in the back: 34 35 1 179 820 you may only need to replace one of them.
12. Clean the boot carpet and replace some of the missing tools in the toolkit (about half are still there)
The tools in my kit (and it seems complete) are:
combination 8/10 spanner
combination 12/13 spanner
combination 17/19 spanner
combination 10/11 box spanner
water pump pliers
wheel aligning tool
spark-plug box spanner
flippable flat/philips screwdriver
hex key for manual sunroof opening
2xkeys for wheel locknuts
once again, welcome