I'v been told before that our Op names are taken from a pre defined list held at MOD, and are not chosen to have particular meanings, unlike the american way of doing things. Like Operation Granby for instance, thats either a Marquess or a town in Connecticut, unless someone else knows a more meaningful reason for the name?
Op Granby was named after a famous soldier, John Manners. Marquis of Granby, (1721-70).
From what I can gather he is most famous for leading a charge at Warburg in 1760 without his wig on (obviously a major faux pas in the 18th century! ) but also well respected for being one of the few officers at that time who cared for his men and he also provided favoured soldiers with funds to purchase taverns on their retirement which would explain why there are more than a few drinking establishments named after him.