Bacon's map of 1879

steve grindlay, our local expert, might be able to help further, but the above map shows canonbie and netherby pretty firmly inked in, and you imagine building started shortly afterwards (1879).

They look to be built on the manor lodge and fair lawn estates, penned in by the crystal palace railway and the tewkesbury estate - which was not 'developed' for another 50 years.

Interestingly the prototype (lower) Westwood park (road) looks rather vague - not really connecting up with anything with much conviction except the bridge built across the railway - which you might expect to be an important link worth connecting up to.
Perhaps it was just a footbridge.