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Th-fronting refers to the pronunciation of the English “th” as “f” or “v”. South-East London in a survey completed 1990-4. The first reference to th-fronting in London speech occurs in 1787.
By 1850 it appears to have been considered a standard feature of working class speech in the city, and had the same status in Bristol by 1880. In his 1892 book A Grammar of the Dialect of Windhill, Joseph Wright noted variable th-fronting in his district in words such as think, third and smithy. For example, the word without was lexicalised to wivoot in some dialects of Northern England.