Getting the voucher ahead of time and paying in advance is the stupidest mistake I ever made. No need to reserve anything ahead of time. Just go there 15-20 minutes before you want to go an the boat and get the tickets from the official provider. This way you are flexible...

I appreciated the cruise guide's commentary on the things we passed while on the river cruise. We were with several school groups who were not English speakers (French, etc.) so they were talking over the commentary, which made it harder to hear. The London Eye was okay, but I wouldn't do it again and we wasted a lot of time because we booked in advance and weren't able to enter the cue for the river cruise or the London Eye in advance. When we went (4/25/2023), the London Eye staff wouldn't allow you to enter the cue until your ticket time (maybe 3-5 min before). I had read that you needed to enter the cue 20-30 min before your slotted time, but this was not the case.

Very good out-and-back cruise of a convenient length and a reasonable price, covering all the main sights and with an informative live commentary. Would recommend taking the company's advice and arriving a good 15 minutes early in order to not be too far back in the boarding queue and getting a good choice of seats.