UPDATE: I followed the recommendation to try the Kotor Cable Car Shuttle Service above. I completed the online form and was contacted a few days later to confirm the booking. I re-confirmed closer to the date by way of reminder and got a prompt reply. Our driver, Novak, was waiting for us as expected near the port. He drove us to the cable car station, bought the tickets and escorted us to the entry gate. He waited in the cafe at the bottom while we took our journey to the top of the mountain. The views were spectacular both on the cable car ride and at the top. We took a ride on the rollercoaster too. Don’t expect a thrill ride but it was fun for an extra 7 Euros. There is also a restaurant, gift shop, kids’ playground and toilets at the top. On our return the driver took us through the mountains and stopped at a viewpoint overlooking the bay for more photos. We were dropped back at the port car park and paid in cash at the end. Do check if they take card payment though (which we didn’t!) as I think the driver had a card reader. It was definitely worth doing this trip and there was time for a wander round the old town afterwards.