Question: Who uses a signalling system known as tick tack?
Disambiguated questions and answers: question: Who in general uses a signalling system known as tick tack?
Who still uses a signalling system known as tick tack as recently as 1999?
Who is the British racing punidt that uses a signalling system known as tick tack?
answer: bookmakers
Billie Brown
Rocky Roberts
Micky 'Hokey' Stuart, Billie Brown and Rocky Roberts
Micky 'Hokey' Stuart
John McCririck
Natural Questions answer: bookmakers (from the Wikipedia article "Tic-tac")