Vaguely serious answer time. Much depends on the settlement in the next spending review. If we get the assumed real terms rise, and also inflation remains static then the review is more about confirming the assumptions made in 2010, and tweaking. I'd expect to see more of the same, possibly a wooly worded commitment to MPA, and maybe minor changes.
If funding situation is worse then all cards are off the table.
The SDSR I'm worried about is 2020 - new stuff in service, wheres the money to pay for it to operate it?