I see that GTR are now promoting advance single fares from Cambridge to Kings Cross/ St Pancras. They look to be only available at weekends. The fares I saw in the journey planner were either £11 or £11.40
They don’t seem to be available from other GN stations on the route. (I checked Ely, Kings Lynn and Letchworth)
Personally I wouldn’t want to be restricted to a specific service especially when GN trains tend to be cancelled on Saturdays.
I think this is a very bad move by GTR.
On Saturdays there are five trains an hour between Cambridge and London via Stevenage, with a further two to Liverpool Street. My view is that Advance tickets should not be sold where there is a 'turn up and go' service which really s th case given the frequency of trains between Cambridget and London.
A Super Off Peak Day Return valid by
any train on Saturdays costs £24.30 or £16.15 with a railcard (there is an even cheaper ticket valid only on Greater Anglia trains only). Thsi ticket can be purchased on the day of travel.
The railway considers this too complicated for passengers to understand and wants to offer Advance ticket, valid only on a speific train. Yes, it might be possible to get a return for £22,
if you can buy the cheapest tier of ticket in both directions, but you'd better make sure you're on the correct train. I suspect many people will end up catching the wrong train home, espacially on the way home after a day out in London.
Advance tickets cannot be discounted with a Network Railcard so it will never be cheaper for a Network Railcard holder to buy an Advance ticket to travel to London at the weekend.
I suspect this is all part of the plan to remove the weekend Super Off Peak tickets. We've just seen an inflation busting increase int he Super Off Peak tickets, keep doing this for another couple of years while claiming to offer cheap Advance tickets. Then, just reduce the number of Advance tickets at the lowest prices.