Glad someone else has seen the light :D
I simply went out and through a combination of Halfords, Machine Mart and t'Internet replicated the content of the OE spec tool roll for an S2:
https://dl.dropboxusercontent.com/u/849 ... %20Kit.pdf
(Incidentally, don't know what it's like on earlier models, but the tyre valve extractor is actually built into the tyre valve caps on an S2). The whole lot then fitted into a very smart brown leather-look wash bag that I found in M&S for a tenner one day (they even threw in some over-powering aftershave for free :D ). The kit was finished off with some latex gloves, an assortment of cable ties, a roll of electric tape and a roll of gaffer tape. The bag squashes neatly within the spare wheel and I pack out the remaining space with jump leads and some 'in the field' cleaning kit.
Also onboard is one of Lionel's spinner tools together with the necessary adapter socket and 'serious mutha' wheel brace. The jack is the original (restored) Metallifacture in its bag - mainly because the square plate is exactly the right shape for the jacking point, the jack itself works remarkably well (if you're not in a hurry), and the whole thing stows neatly flat on top of the spare wheel. A lead mallet sits inside the bag in case anything needs 'persuading'. In the glovebox is a torch, spare fuses, tyre pressure gauge, a Swiss Army knife and a multitool.
Glad to say I haven't had to use any of it in anger yet - although as I'm mechanically inept most of it is there simply so that I don't face the embarrassment of ending up stranded somewhere because something's worked loose and just requires tightening up again. Beyond that I rely on the 21st century toolkit: a mobile phone and a credit card :D