yes from the Abbey website you book on arrival, which was the case when I visited in December 2016.
Tour times
April to September
Monday-Friday: 10.00am, 10.30am, 11.00am, 2.00pm, 2.30pm
Saturdays: 10.00am, 10.30am, 11.00am
October to March
Monday-Friday: 10.30am, 11.00am, 2.00pm, 2.30pm
Saturday: 10.30am, 11.00am
How to book
For a verger tour, you’ll pay entry price plus £5. (From 1st April 2019, the charge for a verger tour will be £7 per person.)
You can book a verger tour when you arrive at the Abbey.
I prebooked my admission so that I didn’t have to wait in line to enter. I arrived about 15 min before opening time, showed my printed-at-home ticket to the staff person managing the queues, and at opening time was let in ahead of those waiting to buy tickets. I then went directly to the desk and got on the list for the first Verger tour about an hour later. I was given a paper bracelet and was free to walk around until the tour started. The Verger tour was really good. Hope you enjoy your visit!