It depends on the year and wheel size, so the most reliable method is to enter your registration or check the tyre size printed on your current tyre sidewall and the driver door placard.
Registration lookup typically returns the factory fitment; if you have aftermarket wheels or changed sizes, search by the exact tyre size on the sidewall and make sure the load and speed ratings meet or exceed Volkswagen requirements.
All-season tyres suit many UK drivers who want one set year-round, especially where temperatures often drop below 7C; choose summer tyres for best warm-weather performance, or winter tyres for frequent cold, snow or rural driving.
Some Passat CC fitments specify XL due to vehicle weight and wheel setup; if your current tyres show XL on the sidewall, or your placard/handbook lists it, stick with XL for the correct load capacity.
You pick a nearby fitting partner and time slot during checkout, the tyres are sent to that garage, and you attend the appointment for fitting and balancing; additional services like wheel alignment are usually offered separately by the fitter.