A comment from Driver Potter about the current operational difficulties on his blog
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PS: I make no comment on how we used to things when every train could couple to every other train because (a) it doesn't bloody help, (b) times have moved on and most importantly (c) looking like a smart arse when things go wrong is what the foaming anoraks do; railwaymen just bloody deal with it!
One doesn't like to be critical of the hand that feeds it, you know...