A good point ards boy! During the winter there wouldnt be much need to position the aircraft back and forward seeing as it does next to nothing during the day, except for LBA on Friday afternoons and couple of pax flights at weekends. Summer is a completely different story however
I once heard that the Royal Mail contract alone pays for 1 x 737 and any pax flights the aircraft operates during the day generates extra income for the aircraft. Same goes for Titan. The mail alone pays for the 146 operation.
Im sure BHD can offer Jet2 a cushy enough deal if they want, but i doubt theres enough stand capacity for an couple of additional based aircraft.