In motor racing, for instance, if a driver is taken to hospital after a crash the metal in the capsule would prevent the use of an MRI scanner, which is essentially a powerful magnet.

British motor racing used to be a gentlemanly affair, just part of the sporting season.

But the majority of those attending dog racing (74%), harness racing (74%), horse racing (70%), motor sports (69%), and tennis (65%) did so only once or twice.