Had the fuel evap canister replaced to fix a strong smell of fuel that was coming from the offside wheel arch. Had noticed the smell for a few weeks, and after a bit of forum searching, found this was the most likely cause, not just on Skodas but other VAG cars too. My mechanic checked for other possible causes too, but agreed with the diagnosis, and it does seem to have fixed the problem. Only a cheap part and quick to fit - around £36 for the OEM part, then a simple matter of removing the wheel and peeling back the arch liner and swapping the canister for the new one. This week it's also had a major service including DSG oil service, and is now running beautifully. This is for my 2018 220 Sportline. Winter tyres on today too.
On another note, recently upgraded my summer tyres to Michelin PS4Ss all round, and the difference from the factory Pirellis is absolutely night and day. What a brilliant tyre - totally changes the drive, and instant traction when you put your foot down.