1920s new works aspirations

Was in the library the other day (as an aside they've installed a Starbucks in it - genius!) and came across 'The Story of London's Underground'. Interesting passage which I can only half remember, but it stated a number of aspirational extensions which were considered important. Interestingly had they gone ahead they would involved South London; providing a kind of mirror to the next decades massive programme in North London.

In no order:

Northern line south to Brixton and Streatham
Bakerloo line south to Camberwell, Dulwich and Rushey Green
Central line to Hackney and Woodford
A New tube from Kingsbury via Cricklewood, Edgware Road, Victoria, Oval and Peckham to Lewisham.

Now no doubt not much planning went into these, perhaps at most a line on a map, and I assume most of these would have followed established throughfares.

However I can't quite see an obvious one between Dulwich and Rushey Green, which apparently is by Catford, and I can only presume that between Peckham and Lewisham the route would have gone to where Goldsmiths College is then turned south to follow Lewisham Way.

Don't suppose anyone could provide any more information or confirmation? For anyone that has the book its on page 98.

Thanks in advance!