Here are are a few sayings to help memorise the order of dressage letters the arena.
20m x 40m Arena
Clockwise
All King Edwards Horses Carried Many Brave Fighters
All King Edward's Horses Can Manage Big Fences
All King Edwards Horses Can Move Beautifully Forward
All King Edwards Horses Can Make Big Farts
All King Edwards Horses Can Move Bloody Fast
All King Edwards Horses Canter Merrily By France
All King Edwards Horses Can Make Beautiful Foals
Anti-Clockwise
All Fat Brown Mares Can Hardly Ever Kick
A Fat Black Mother Cat Had Eight Kittens
Invisible Letters - From A
Do Xtra Good
20m x 60m Arena
Clockwise
All King Victor's Expensive Show Horses Can Make Really Big Pongy Farts
All King Victor's Exceptionally Stunning Horses Can Manage Really Big Plastic Fences
Anti-Clockwise
A Fat Palomino Broodmare Rarely Makes Calm Horses, Several Extend Vicious Kicks
Invisible Letters - From A
Doing Lots Xtra Is Good