Having handed over my £500 and driven the Jag home, it was time to look in to what I'd actually bought. Turns out there's a wealth of Jaguar, and specifically X300 XJ6, information available online, and in around 10 minutes I had the complete 1995 X300 XJ6 literature pack in my digital glovebox.
I'm struggling to find the exact price of a new 1995 entry-level 3.2 XJ6, but seeing as a '94 entry-level previous-generation XJ40 2.9 was £27,350, lets call it around £30,000. For that you got a 216bhp, 232lb ft straight-six petrol engine with four-speed automatic gearbox capable of 0-60mph in 7.9sec - not bad for a 5m-long, 1800kg car.
Initial acceleration tests show that many, many of those horses have either died or are at the knacker's yard, but still, give the throttle a sharp prod, drop a gear or three and there's still some half-decent performance to be enjoyed at the business end of the rev range. Importantly, the engine and 'box feel sturdy.