On a point of order, and at the risk of being accused of Nigelism, I'd just point out that...

1) It's not 'the Trooping of the Colour', it's 'Trooping the Colour' - no definite article, and no preposition.

2) The funny hat worn by Guards regiments isn't a 'Busby', it's a Bearskin. The Busby is a much smaller fur hat, shaped rather like a large Fez, which is worn by, for instance, horse-artillery.

Carry on, Number One....