He walks with a trot, indicating a previous leg injury. He is also simple minded but despite this he maintains a vast knowledge of horses.
Curly warns Thomas Shelby his newly bought horse has been cursed and will soon die. He seems very distressed.
Two years later (1922)
In Episode 2.4, Thomas calls Curly 'the best horseman in England' while he shows May his horse, Grace's Secret.
Two years later (1924)
The two trained and cared for Grace's Secret, Thomas' race-horse.
"No heart in motorcars, I can't talk to them." — Curly in Episode 1.3
"Wh-while you're waiting for the man who doesn't exist, would you like to try some of his gin?" — Curly to May Carleton
"Charlie, Curly, this is Jessie Eden. Jessie, this is my uncle Charlie and my... whatever Curly is." — Thomas Shelby