How kind of them to "make the concept easy to understand" by moving their Luton flights back to BFS. From my point of view the concept is simple.
Taxi from Casa FF to BHD (Valucabs) - £6.50
Taxi from Casa FF to BFS (Valucabs) - £25.00 at least
Taxi from BHD to Casa FF (Valucabs) - £6.50
Taxi from BFS to Casa FF (Valucabs) - £25.00 at least
Public transport from Casa FF to BFS and back - £24.40
Public transport from Casa FF to BHD and back - £10.40 (ridiculous you can't use metro smart tickets on this service anymore. It doesn't really encourage you to use public transport).
There's absolutely no point in us booking domestic flights from BFS. We only go there for holiday flights.