25M
I think you guys are getting ahead of yourselves here, whatever potential LTN has I cannot see 25M without a major change south which will involve county boundaries. STN will champion in the end because it has the space. MAG can sit and wait.
London is a great powerhouse (sorry my friends up norf). Will LHR T6 or LGW 26 /08 x 2 ever come online.....?
My biggest regret, is where the VVIP traffic will end up. OXD and NHT doing well but not true 24x7 like LTN has offered (excluding 7-8AM).
Perhaps move all the FBOs south and this will generate 10+ stands, then again a T2 would make sense...I think this must already be thought about (as any grown up business would) - Thankfully the days of short term minded profit by concession owners have passed!