No definite commitment to demolish T1- it's still a wish list item. Certainly won't be 2024. Blue Skylink buckets will be needed for many more years yet.
Aside from Government Airport Taxes- each MAN passenger pays £12.12 each as a Passenger Facility charge in addition to £6.25 per person for security screening. This applies whether you use a loco or a full fare outfit. Some airlines possibly have deals where this is not passed onto MAG in full. However, non the less in 2018 MAG made record profits and paid out record dividends to shareholders.