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Sorry, the Director exchanges went a long time ago certainly before 1995. Since then the whole of London has been on digital exchanges (Sys.X or AXE).Err, I believe 0203 is actually a correct London code. It is the not so new overflow from 0207 & 0208 (inner & outer iirc).
Director (ex-) exchanges still have 3-digit grouping and 4-digit sub's numbering.
The London Code is 020 (similarly, Coventry is 024 with 76 added as a prefix to the old 6 digit numbers, Northern Ireland code is 028) with '3nnn' a London wide routing, '7nnn' inner London and '8nnn' outer London.