I think 45m is probably a "fair" price, considering his age. I know you won't agree and it's not a reflection on his talent alone. He's still firmly Englands number 1.Turning down 45m would be shocking. Hell turning down 30m would be bad. If these are the types of numbers in play he should be sold to the highest bid we can get.
I doubt he will push for a move, by all accounts he's very happy here, but United is still local.