It is mandatory that all riders wear both chest and back protection.
Nora/ACU will check in holding area or start line not at scrutineering.
No Armour/No Ride!!
It is also Advised /Recommended that Body/Kidney belt is also worn (But not Mandatory for 2018)
Currently, there is not a specific standard required in the UK but the European ruling is En 1621-2 (Back) and En 1621-3 (Chest)
If you are intending to buy new ? Then look for these codes sewn inside the armour as 2019 may possibly require these approval numbers to be mandatory.
If you currently wish to ride on the continent it IS mandatory these codes are sewn inside your armour so look when purchasing …..
You have been warned !!!!