In his fantastic book on London street signs, @alistair documents the rebranding exercise that the City of London undertook in the 1980s, which resulted in the wholesale replacement of its street signs. I do have a soft spot for what went before though, including this beast from Great New Street.
@lccmunicipal @alistair I was honoured to get a mention in Alistair's book following the work on Hackney's surviving N.E. postal district signs:

