From Chiswick's Wikipedia entry - "From 1894 to 1927 the parish formed the Chiswick Urban District. In 1927 it was abolished and its former area was merged with that of Brentford Urban District to form Brentford and Chiswick Urban District. The amalgamated district became a municipal borough in 1932. The borough of Brentford and Chiswick was abolished in 1965, and its former area was transferred to Greater London to form part of the London Borough of Hounslow."If the 1927 merger had combined Chiswick with Ealing or Hammersmith rather than Brentford then the likelihood is that in 1965 it would not have become part of LB Hounslow.
Richard Greenhough ● 1593d