If it made sense to reduce Birmingham to Manchester to 2tph made sense, I'd rewrite the timetable completely to have something like this:
00 Glasgow (Crewe, Warrington, Wigan, Preston, Lancaster, Oxenholme, Penrith, Carlisle, Motherwell)
03 Liverpool (Stafford, Crewe, Runcorn)
07 Manchester (Milton Keynes, Stoke, Macclesfield, Stockport)
10 Birmingham (Watford Jct, Rugby, Coventry, Bham Intl)
16 LNWR Crewe (Milton Keynes, Rugby, Nuneaton, Tamworth, Lichfield, Rugeley, Stafford)
19 LNWR Birmingham (Watford Jct, Milton Keynes, Wolverton, Northampton, Long Buckby, Rugby, Coventry, Canley, Tile Hill, Berkswell, Bham Intl, Marston Green)
30 Chester (Crewe)
33 Liverpool (Stafford, Crewe, Runcorn)
37 Manchester (Nuneaton, Crewe, Wilmslow, Stockport)
40 Birmingham (Milton Keynes, Rugby, Coventry, Bham Intl)
46 LNWR Crewe (Milton Keynes, Rugby, Nuneaton, Atherstone, Polesworth, Tamworth, Lichfield, Rugeley, Stafford)
49 LNWR Birmingham (Leighton Buzzard, Bletchley, Milton Keynes, Wolverton, Northampton, Long Buckby, Rugby, Coventry, Canley, Tile Hill, Berkswell, Bham Intl, Marston Green)