No idea what the costs at FR are. CAE would be better than LGW, because then you can stay in one location; i.e. easier to find accommodation. Do you intend to take your car from Norway? Always useful where-ever you go.
Accommodation can be varied at CAE. The costs are much the same €25/n. This could be B&B on your own, B&B shared house, or B&B self catering. All the same. Quality differs. FR could be easier to sort out your files, uniform, base training schedule etc. You are close to mission control. Due to the changing sim schedules sympathetic accommodation is needed. Can you get breakfast at 04.30? Can you have access to snacks at 01.30? If you don't take a car then FR will require taxis in the night hours. CAE has good public transport 24hrs, depending on where you stay.