The TFLY LPL arrangement that you mentioned no longer exists as the Crew base at LPL has now closed.
Voluntary it was - but, actually, in the first couple of seasons the Taxi time was still counted before and after the flight but just appeared as Own Way Travel on ones roster - also a cushty £40 quid own way travel payment went in for each flight operated at LPL to represent the cost saving of travelling from MAN using your own means. Great if you lived in Garstang!
This payment was later removed as LPL became a bona-fide Summer Base last year (i think). Only cabin crew were based there and all FTLs started and finished there for LPL based crews. They were rostered solely from LPL and if MAN were rostered I believe that their FTL would have started from LPL.