What would London look like if it was the other way up?
It would look like this.
What I did
I took the Greater London boundary (red).
I rotated it through 180°, centred on Charing Cross.
(click to embiggen) Places that would no longer be in London
» Uxbridge, Ickenham, Harefield, Ruislip
» Enfield Wash, Enfield Lock, Chingford
» Collier Row, Harold Wood, Harold Hill, Hornchurch, Upminster
» Chelsfield, Green Street Green, Biggin Hill, Old Coulsdon, Chessington Places that would now be in London
» Carpenders Park, Bushey, Oxhey, Radlett, Borehamwood, Cuffley
» Buckhurst Hill, Loughton, Grange Hill
» Purfleet, Dartford, Swanley, South Darenth
» Woodmansterne, Stoneleigh
» West Molesey, Walton-on-Thames, Sunbury, Ashford, Staines, Wraysbury
And how far would the tube stretch?
What I did
I visited a site called Trainspose.
It lets you superimpose maps of Metro systems on other cities.
I tried to keep the Circle line much the same.
(you can have a lot of fun with this site)
North of the river there'd only be tube lines out to Leytonstone (Richmond), Southgate (Morden), Golders Green (Brixton) and Heathrow (Dagenham).
But south of the river the tube would stretch as far as Kempton Park, Cobham, Richmond Park, Croydon, Beckenham, Bromley, Eltham, Bexleyheath, Erith, Swanley, Lullingstone and Wrotham.
Some would say that'd be a big improvement.
Obviously if you rotate London and the tube through 180°, all the stations end up in the same place.
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