Since late 2019, a typical single Sail & Rail fare to London has risen from €47 to €59.
€6 of this increase seems to be the removal of a discount that applied if you booked more than a certain amount of time in advance (24 / 48 hours). I presume this was designed to increase revenue from the very limited number of passengers using the service during the pandemic.
€47 was brilliant value to get to any station in Britain as long as you had the time to spare for a 4 hour boat journey first. €59 less so. Let's hope they re-introduce the early booking discount soon.