Question: Who uses a signalling system known as tick tack?
Answer: bookmakers
Disambiguated annotations:
qaPairs: question: Who in general uses a signalling system known as tick tack?
answer: bookmakers
question: Who still uses a signalling system known as tick tack as recently as 1999?
answer: Billie Brown
Rocky Roberts
Micky 'Hokey' Stuart, Billie Brown and Rocky Roberts
Micky 'Hokey' Stuart
question: Who is the British racing punidt that uses a signalling system known as tick tack?
answer: John McCririck