long-running dispute between racecourses and drone operators streaming live action from tracks appeared to escalate on Friday as the chief executive of the UK Racecourse Association, warned that a new streaming service advertised on Twitter on Thursday is “breaking the law”. The drones send streams with little or no latency – to punters betting in-running on the Betfair betting exchange, giving them an important edge over backers watching coverage on Racing TV or Sky Sports Racing.