If there is to be a new base at Southend or Cambridge, then FR would have to be careful to ensure it doesn't end up inadvertently cannibalising business from its existing operation at STN while incurring the additional cost of a 3rd base serving the area around London north of the Thames
Having said that, it might be a good way to keep STN management on their toes... in the same way as Easyjet at BFS+BHD