We're a family of four going from Catford to Cambridge one weekend shortly, via Backfriars (various reasons need to avoid the underground). The two kids have zipcards and we have a family railcard.
It looks like the cheapest way is for the kids to go free between Catford and Blackfriars and for us adults to pay £13.20 (four times single contactless fare of £3.30), then £36.20 for a return from Blackfriars to Cambridge (total £49.40).
There isn't some other way maybe involving boundary z6 tickets for the kids is there, or any cheaper options!?
It looks like the cheapest way is for the kids to go free between Catford and Blackfriars and for us adults to pay £13.20 (four times single contactless fare of £3.30), then £36.20 for a return from Blackfriars to Cambridge (total £49.40).
There isn't some other way maybe involving boundary z6 tickets for the kids is there, or any cheaper options!?