Pat,
Re the list of old London exchange names which is archived here:
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It's been pointed out to me that the entry for BOWes Park 209 incorrectly shows that this office served the Twickenham area, which is in southwest London.In fact the BOWes Park office served the Wood Green / Bowes Park district of north London. I'm not sure why I didn't spot the mistake, as my own family lived around that part of north London years ago, so Bowes Park was only just up the road.
Anyway, perhaps you could make an appropriate amendment in the arhives.
- Paul.