BBC News - Long, long slog to mend public finances
Read this...it's Peston doing his thing, but the meat of it comes from the OBR
This quote is particularly grim
It shows that that if a new Tory government delivered on its pledge to protect spending on schools and hospitals, the cuts for other public services - such as the police, courts, social services, local government and so on - would be so big as perhaps to defy credibility.
Defence would come under "...and so on" in that quote.