In Scotland I seem to remember a granny was something you put on the chimney pot to catch the wind and improve the draught! - TTN
Absolutely correct, but here's an Englishman with a draught up his kilt, "walting" as a Scotsman - in order to avoid thread creep you understand
https://uk.search.yahoo.com/yhs/sear...anny+off+a+bus 
Jack