Twickenham is probably the worst, planned before the war, resited with more platforms in 1950s, never finished, although did build new entrances as part of adjacent development about 5 years ago.
Crawley was rebuilt 1950s or early 1960s as part of the new town, and nearby Gatwick Airport was done as part of 1958 terminal (since massively enlarged).
The GWR rebuilt a series of stations between Acton and Ruislip on its line for the extra tracks for Central line extension 1946-48, some had been designed before the war, but altered due to materials constraints, there was to have been another one at Denham, but not built due to Green Belt introduction.
Slightly before the period you want, but Pokesdown where an island platform was replaced by 4 track layout was apparently a pilot for new generation of Southern Railway suburban stations, completed just before the war. The through tracks were removed in early 1970s and platforms slewed so canopies no longer line up but can see elements that made it into some 1950s Southern stations