It is implied by many including Inspector Campbell, his brothel is often visited by police men. While the men are paying for the girls, their clothes are being washed and dried.
His daughter Mei is a 'fortune telling girl' who supposedly put a spell on Thomas Shelby's horse at the start of Episode 1.1. That same horse won races two times in a row, which helped kick off the Shelby business. But any blessing Mei put in place, faded on the third race which the horse lost.