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One small question - does newer dual voltage stock (since the 313s)
have the capability to switch between third rail and overhead on the
fly between North Pole and Shepherd's Bush? The 313s were designed
only to switch in stations (Drayton Park actually) but no-one
envisaged a changeover point between stations in the 1970s.

No, Desiros and ElectroStars also come to a complete stop for what seems
like an age for the voltage change. If anything, it seems like they take
longer than the 313s, presumably because of the complex electronics and
computers that may need rebooting.