Frog, my thoughts would be to be pushing for 200+ before considering declaring. It's only day three tomorrow and there's some very bad wether coming up at the weekend. I'd hate it to be a draw and they retain the ashes.
After the dismissal of Root I think Wood is going to have a great second innings.
Books and Stokes along with the batters (because we can no longer say batsmen) that are yet to come in will knock another 150 before lunch.