if i want a weekend punt i normally book in advance,and if theres someone i want i would try and pre book and never on the same day,the day i do same day bookings is on a monday where i get a buzz when trying to get a punt within a 3 hour window,some good most bad,
as for sat punts, some girls dont advertise as they have bookings lined up,and only see "regulars" who fone on off chance