There are many myths and traditions associated with chimney sweeps,  good luck and weddings. One reason from folklore is that when on one occasion King George II's carriage horses bolted the only person to attempt to stop them was a small sooty figure of a man, a chimney sweep. It is considered extremely good luck on your wedding day, if on the journey to the Church, you see a chimney sweep and even greater good luck if you saw the sweeps brush emerging out of the top of the chimney. So to this day to see a chimney sweep and receive the Kiss of Luck after the wedding ceremony is supposed to bring good fortune to the newly married couple.
Some Bride's and Groom's to ensure their good fortune will employ a real live sweep to be present on their Wedding Day as did Stephen Hendry The World Champion Snooker Player when he married.

 

Chim chim erny chim chim cheeri
A sweep is as lucky as lucky can be
Good luck will rub off if I shake hands with you.