Yes, I do know that, thanks.
Is the taxpayer providing every horse rider in the country with a florescent tabard ALARP? I'd love to see that argument developed convincingly; I doubt it can realistically be so argued.
And what about when horse rider forgets/chooses not to wear tabard? What's the ODH to do?
Let's face it: The horse rider is the one at risk, as the H&H article describes well and fairly. A florescent tabard can be obtained for £1.99, and so avilability is not an issue. The only person who can ultimately mitigate the hazard via hi-viz is the horse rider.