Expansion and any new routes
Wizz don't mind bus stands but will only have them at a much lower cost than normal. Wizz always choose the cheaper option so there won't mind. In the morning 8 planes already have to go on a bus to get to the plane so I wouldn't think airlines mind that much.
With both Atlantic airlines and Firnas Airways needed a London base could it be LTN. Who else could LTN maybe attract. Maybe see if Sun Express and Air Nostrum will be back next year as both had 95% load factor.