If you're on the time and distance servicing regime, then as you've said, the service interval is 10,000 miles or 12 months, whichever occurs first. If your car's under warranty, I wouldn't risk running up to 18,000 - 19,000 in 12 months under 'time and distance' before you get your car serviced; if you need any work done under warranty, you're just giving VW a reason to not carry out warranty repairs and / or void your warranty on the basis that the vehicle hasn't been serviced in accordance with VW's requirements, so technically you'd be in breach of the warranty conditions - see the copy of the warranty servicing requirements below from VW's website.
You can have the service regime changed to long life from time and distance, when you get it serviced.
Servicing
Your vehicle should be serviced in accordance with the manufacturer's recommendations. Any damage to or defect in the vehicle caused by poor or insufficient servicing will not be remedied under the vehicle's warranty. Please ensure that you maintain sufficient records to enable our Authorised Network to confirm that the vehicle has been appropriately serviced. In any event, please ensure that the service schedule booklet in your vehicle is stamped by the business carrying out the service work.