I'll have a stab at g. It is a Hastings unit on a 4 track line and there seems to be a spur entering from the right so it might be Petts Wood
Yes - spot on. Petts Wood Junction.
The main line from Sevenoaks to London Bridge is 2 tracks to Orpington, where it becomes 4 tracks - fast lines on the West and slow lines on the right. At Chiselhurst, it crosses the line from Victoria to Rochester and beyond - which had also become a four track line by the time this photo was taken. Spurs / cutoffs connected the lines, originally built by two different companies - the South Eastern Railway and the London, Chatham and Dover; they merged in 1899 to form the South Eastern and Chatham Railway. Changes to the cutoffs after this picture was taken allowed Eurostar trains from London to reach the fast lines to Orpington without having to cross the slow lines.
The six coach Hastings demus were (are - one is preserved) narrow bodied due to tunnel width south of Tonbridge. They were replaced by electric trains, and one of the improvements made at that time was the singling of the tunnels to that standard stock could be used.
Edit to add - History and track plans at
http://www.kentrail.org.uk/chislehurst_junction.htm