Note: Australia is generally considered to be a continental landmass, rather than an island. If however one does count Australia among the islands it, not Greenland, would be the largest in the world (unless one also considered Antarctica an island).
... City Railway) remain open as mainline stations:
Great Missenden tube station[?]
Wendover tube station[?]
Stoke Mandeville tube station[?]
Aylesbury station[?]
West ...