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e.g.

...
Mayfair (north)\tGreater London
Mayfair (south)\tGreater London
...

Town\tCounty\tVALUE

$tmp=(get the file contents);
$tmp=~s/\r//g;
...
} else {

....

# attempt 2

...
    $tmp=~s/^$n\t$v$/$n\t$v\t$ctr/;
        $gctr++;
   }