Is that relevant to the existence of a fare between Blackpool North and Blackpool South? There is no 'Blackpool Stations' destination of course.Isn't Kirkham and Wesham in a different ticketing group than Blackpool North?
For what it is worth, for fare setting, the cluster QA17 includes all stations west of Preston. Q328 just the stations on the two branches, in which instance Q336 is the cluster for stations around Preston including Kirkham & Wesham. There may be others.
That is probably because there isn't an obvious route between the two that doesn't involve a double back. No fares exist between those two - £19.20 must be the sum of two single tickets.Runcorn to Runcorn East is £19.20 for an anytime day single, however it just quotes the Cheshire Day Ranger during off-peak times for £25.20