Thanks for the responses.
Triumph 400? Reported to be much better in many ways than the GB350S, other than price!
I am looking (online) at a GB350S at the moment.
The one that I would buy back? The best of the bunch was the Gilera SP180. Fast two-stroke scooter, and a scream to ride. I don't think there is anything similar enough.
Modern scooter? I have been looking at Suzuki Burgman in different engine sizes for many years. A review I read said that the weight of one of them was 250Kg. That's the same as my GS Adventure. I have also looked at the Yamaha T-Max
Intercepter saddle? Yes I have a problem there. I part-ex'd my Pan European because I found the seat uncomfortable. The dealer said that there was only one bike with a better seat - the Goldwing, hence buying that.
Welds etc.? I get the feeling without even seeing them that the quality won't be up there with the Japanese bikes.
Weight? The lower the better!
I live on a remote island now, so don't need or want something huge, but something the carry my partner on would be useful. My age, previous no claims and location mean that my insurance in cheap. I think it was about £140 fully comp on the GS last time. Maybe a few £££s less.
Until recently I was considering a bike and sidecar. I missed a very nice BMW K75RT with a Squire RX4 chair on it for what seemed like a very good price. I am still kicking myself about that.