Here's a 2+2=8 scenario - If the Scots do their own thing, and the SSBN fleet moves to Devonport, and UK MOD acquires an MPA fleet, where would they go?
St Mawgan? Yeovilton? Waddington?
St Mawgan? There's an RAF station there still, but it doesn't have a runway. Although the adjacent Newquay Cornwall Airport may be glad of the business!
S-D