The Real Doctor wrote:

"And standing" normally means at most one extra passenger per row of
seats, so 25% over capacity. Good luck carry several extra trains' worth
that way. This is long distance stuff we're talking about, not the
commute from Milton Keynes to Euston.

The GWML is a glorified outersuburban operation these days. Crush-loads
are not at all unknown.

The term full and standing tends to mean "you're unlikely to fit on".

Neil
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Neil Williams in Milton Keynes, UK. Put first name before the at to reply.