is impossible without the agreement of others
So what are they to do if Southend say "no, it does not fit in with the expansion plans". And the RAF say "no, unless you pay through the nose for the lease or rent". Do the planned base moves stall until a green field site is developed (at huge cost) or an alternative brown field site is developed (at huge cost)? All in all, not much of cost saving/improvement of service going on.