The May 1990 issue of Word Ways carried an article of mine entitled "London Wordplay". This was an examination of transposals, transadditions, beheadments and a variety of other wordplay based on place names in and around London, England.
"600 Transposals of UK Place Names,"
Word Ways: Vol. 36
, Article 6.
Available at: http://digitalcommons.butler.edu/wordways/vol36/iss3/6