The Godfrey Edition reprint of the 1870 (survey date) OS map of Dulwich Village clearly shows Netherby Road and Canonbie Road but shows nothing in the Westwood Park area (other than some nearby field boundaries).

Joan Read's list of Lewisham street names states that both Canonbie and Netherby roads were named in 1865, that Canonbie was named after a village in Dumfries and Netherby, a village in Cumberland. Presumably the builder(s) had connections in those parts.

The broad parallel lines on the Bacon Edition map do seem to correspond approximately with the line of Westwood Park. However there is nothing visible in that location on the OS map surveyed 1893-4 and I don't believe that section of Westwood Park was laid out until the houses were built in the 1930's.

There seems to have been very little development in either Canonbie or Netherby Road until the 1890's or even later so if the roads were built as a speculative development, the builder may have had to wait quite a few years for a return on investment.

Interestingly, Canonbie Road is clearly visible from the London Eye on a clear day because it is in almost perfect alignment (as is evident looking at The Eye from the top of the hill). It is probably one of the most distant roads that can be identified from The Eye.

Shortly after 9/11 homes near the top of Canonbie Road were visited by Special Branch police investigating whether they might be suitable sites for anti-aircraft operations!