OK, well update from me:
I bought an Octavia earlier today. Went to dealers where they had a dozen for sale. I looked at two 1.5TSi DSG SE L ones (both 2020, 28k miles). Couldn't quite settle myself on either, slight misgivings on the history/condition of both (one of them had had a "non-warranty repair on 3 separate occasions", and 4 different tyres; the other the coolant level was below minimum, which is not catastrophe, but not reassuring). They'd both been serviced on the 20k intervals
Then I looked at another one, 1.5TSI, but 6 speed manual and only SE Tech trim, 2019 and 37k miles (and £4k cheaper). The service history on that stacked up a bit better for me: two matching Michelin Cross Climates on front (following MOT advisory), 2 matching Nexans on the back. Last service in the dealer system was from 18k miles, but when I took a look through glove box on test-drive, there was a paperwork for a further Skoda dealer service, and another service at an independent garage (with the name of the owner on the top), and the mileages all add up. Plus I have a bit more cash held back in case there's anything I need to deal with out of warranty eventually.
So I've put deposit down on the car and should pick it up Saturday week when I'm back in town.
Sincerely, thanks again for the help here. Even if I didn't go for the DSG, it wasn't because of unfounded fears of repairs, so the help was very welcome and useful. I'm now in (or shortly to be so) the Skoda family! (my 9 year old seems happy too, when I showed him picture of the car, he declared "oh, it has the bird!" (logo), I asked "is that good?" to which the response was "oh yes! It's like a crazy chicken!"... so there you go!)
Finally: on Camry scarcity. They stopped selling them altogether in UK in 2020 or maybe during 2021. However Toyota kept selling them in Republic of Ireland, so it's probably the only make/model of car where there are more examples for sale in Ireland than in the UK... just checked and Autotrader has 40 in total, while in Ireland Done Deal has over 250. However I think there's new revision coming, and it's been confirmed it won't launch in UK, and I don't think it will launch in Ireland either. Some Japanese used imports might turn up over time; worldwide the Camry is a huge seller.