Rach,
Yes our group last year was 45 which was big. But the holiday was new to JY possibly wont be that many this year.
Think 45 was the max but I've also done a touring holiday with only 18 on it.
You are best to use the Ask the editor section of the forum and Julia will tell you how many are booked.
Mick
Hello Anne & Paul, trust you are both well and have this years holidays planned.