I think we have discussed this before. The conduits into London depositing the diaspora at their respective entry points; the Scots in King's Cross, the Irish in kilburn, the French in Croydon...
Yep, that's it.
Ruislip, on the 'Chiltern Line', could plausibly have been an entry point for Brummies and other West Midlanders who could find the Snow Hill terminus in Birmingham.
I think we have discussed this before. The conduits into London depositing the diaspora at their respective entry points; the Scots in King's Cross, the Irish in kilburn, the French in Croydon...