Just priced the 5 trips up seperately, and the frequent traveller ticket works out £100 MORE.
Reason is the cost of the day trip booze cruises. Unfortunatly due to work and kids we have to travel on the trains that carry the supplements, so a day trip works out at £118, booking a one off day trip, same time trains is £49.
Thanks for the pointer to them Deb, once we are retired and the kids have b*ggered off we may be able to make use of them.