The nearest airport to Sorrento is Naples. The flight time from London to Naples is 2 hours 40 minutes. It is then an hours drive from Naples to Sorrento, via Taxi/Car or Bus.
On the day of the wedding, the venue will arrange to drive all guests from Piazza Antiche Mura ( In front of Ikura Sushi), to the venue. This will be departing at 16:45.
There are lots of places to stay within Sorrento, take a look on bookings.com or AirBnB. We are staying at Hotel Michelangelo.