Southport are safe CAS.
Northampton probably need 15 or 16 points from their final fixtures to reach 50+, thus they are doomed. Looking at the matches remaining, I cant see them gaining over 8 points.
Brackley, equally in poo, four away fixtures against York, Forest Green, Scunthorpe and finally an away match at Carlise. These should return nil points, leaving the home games with Braintree, Boston, Aldershot and Tamworth, as the only chance to escape the drop. Ten points from those four, which may just be enough on 47 for the season.
Banbury lost again on Tuesday, and reaching the play off places is starting to look beyond them now.