The centre platforms at E finchley are sometimes used by short-working trips etc:
Definitely. Oddly enough on my first visit to East Finchley (whilst 'ticking off' all the Underground stations) I used one of the short workings from a centre platform for the next leg and thought nothing of it for years later.
I suppose that makes sense... but it slightly smacks of that old BR Railfreight thinking of "assume what x industry sector will need, then give them something different and they'll have to like it or lump it". Of course, most industries decided to lump it and used large transporter trucks for the whole journey instead.
Perhaps my memory is playing tricks on me but I am pretty sure that Ford Transit vans used to go to Wakefield from the erstwhile plant at Swaythling, either from Southampton Bevois Park or Eastleigh.
Ford was a very big customer for BR and I pretty sure that the conversation went pretty much along the lines of "we need to move a lot of vans to West Yorkshire, what can you offer?" Healey Mills was a rail-locked marshalling yard, not relevant to block automotive trains. Leeds Stourton Container Terminal was for, er, containers. Wakefield fitted the bill nicely.
I know that RailUK Forums seems to have an obsession with 'County Towns/(Cities)' as if they all have the commercial and real estate significance of Manhattan or Singapore but have never been entirely convinced that Wakefield fitted that description in the 1970s.