Met back to Aylesbury in conjunction with electrifying Chiltern (overhead). Stock would change over at Harrow with a second changeover point at Moor Park if necessary. Also, the new stock would have gangways throughout and toilets, just like (say) a 450.
Build a flyover at Canonbury and get the ELL to Finsbury Park. Consider extending it to Edgware via Mill Hill East, possibly taking over the High Barnet branch as well, with the Northern going to Alexandra Palace.
Run the proposed Chelney line up the Thames via Fulham, Barn Elms, Chiswick and Brentford, where it would split. One branch would go to Boston Manor, then follow the old Brentford Goods branch to Southall. The other would run via Syon Lane, Hounslow and Feltham to Hatton Cross, then go around the Heathrow Loop the opposite way to the Piccadilly, but including Terminal 5.
Plug the Waterloo and City into the DLR at Bank, with a new station at Blackfriars
Extend the Bakerloo to Camberwell, Queen's Road Peckham, New Cross Gate and Lewisham
Extend the Victoria to Crystal Palace
Extend the Central to Denham
Put the Epping-Ongar Railway on the diagram
Modify the diagram so it looks more like the HC Beck 1964 version (which was a lot clearer than the one they used)