I am also very interested in the Bowyers who were also Butchers in the meat markets of East London.Their Mary Ann Bowyer (born 1804 Betchworth, Surrey?) married into my Pain family in 1824 and gave rise to three generations of Bowyer-Pains, many of whom were Butchers in the Holborn, and Hackney areas of London.
I have also found possible Pain family links with Wiltshire, which is where the Bowyer Sausages were made (and still are as part of the Allied Foods Group?).
I have not been able to positively identify Mary Ann Bowyer's parents, but her marraige to Thomas John Brooks Pain was in Southwark, Surrey,