I don't believe passengers living close to LBA so readily accept travelling to MAN as we loved to do a few years ago. Road traffic conditions and delays these days cause even more stress for many passengers. And, as we know, the airport is not even in Manchester. It is not uncommon for long haul or early departing pax to travel to Man the day before and stay overnight in a hotel.
In my opinion, continuing to consider LBA to be in the Manchester catchment area, is stretching this too far these days.