More drivers required.
The PR guff about 'enough drivers to drive come December' came from re-doing many diagrams and redistributing work, ie skin all diagrams to the bone, bare minimum PNBs and same train all day, divvy some links up into AM only and PM only and then redistribute work across the depots. Result is p*ssed off traincrew and even more fleeing the nest, so expect this problem to continue.
Crewe depot are being stretched at the moment - they now sign to London. Not all of Northampton/Bletchley have completed their 110 training so the Crewe services are quite vulnerable to cancellation. Shouldn't be a problem for them though -throw a shiny penny their way and they're quite happy to do anything for you...
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Yesterday/today has seen 170s on the Liv Brum diagrams as a result of the chaos...