Well if it's one of the direct injected petrol models, it's prone to carbon buildup on the valves, which can be cleaned preemptively - if the buildup gets too bad, it can wreck the valves IIRC. If it's a DSG rather than a conventional automatic or manual, those can be problematic depending on the exact version. Expect a couple grand to fix if it goes wrong. Any chain-driven VAG engine usually doesn't have a very long lifetime on the chain and they're a pain to replace.
I wish you luck with the Tiguan, but honestly if I was a Brit living in the countryside, I'd rather be driving a Land Rover. Not that I expect it to be less problematic than VW, I just think they're cooler and it's the one country where LR enthusiasts and independent workshops are plentiful.