How about a bit of a route simplification as well?
Southern Route: Liverpool Lime Street, Manchester Oxford Road, Manchester Piccadilly, Stockport, Sheffield, Rotherham Central, Doncaster, Scunthorpe, Grimsby Town, Cleethorpes
Scottish/West Coast Route: Manchester Airport, Manchester Piccadilly, Manchester Oxford Road, Bolton, Preston, Lancaster, Carlisle, Glasgow Central.
Eastern Route: Liverpool Lime Street, Manchester Victoria, Stalybridge, Huddersfield, Leeds, York, Darlington, Durham, Newcastle
A fair bit of Manchester Airport traffic should either be on Northern for Semi-Fast or Stoppers into Manchester and onwards to Liverpool or south to Crewe and then Stoke.
It is meant to be express so it should only run Fast or Semi-Fast services with the Fast services being the Nova 1, Nova 2 and Nova 3's while the Semi-Fasts are run by the Class 185's