It was fortunate. 🙂 He was a very atypical LS owner, too. I was expecting to meet someone in the same ... er ... 'demographic' 😉 as most of us here, but he was really young. He seemed to know the LS400 innards very well, but I don't think he was a member here. Yes, I SORNed S325APK and let the last MOT lapse when the whole CV19 thing happened.
To the OP, and back to the cambelt cost: it's always tricky with a car this old, but I always try to think of a spendy outlay like this as a cost to split across the number of years you expect to own the car. So £1000 is expensive as a lump sum so soon after purchase, but if you expect to keep the car for 5 years, then it's only £100/pa more than my (very lucky and long-gone) deal at Lexus. And with that done and such low mileage, it'll be more attractive to the next owner.