Oi! began in London with the LP titled "Oi! the Album" released in 1980
After all that poncey new romantic cobblers, and the music press had declared that punk was dead. Oi! confirmed that the spirit of punk as it had been in 1976 &1977 was still very vigorous.
Exploited, who were from Scotland, had two tracks on "Oi! the Album". So although Oi! began in London, and was a very London working class style, it was not confined to London.
More on this topic later............