Rule 49  Safety equipment. Children under the age of 14 MUST wear a helmet which complies with the Regulations. It MUST be fastened securely. Other riders should also follow these requirements. These requirements do not apply to a child who is a follower of the Sikh religion while wearing a turban.
[Laws H(PHYR) Act 1990, sect 1 & H(PHYR) Regulations 1992, reg 3]

 Rule 50  Other clothing. You should wear
boots or shoes with hard soles and heels
light-coloured or fluorescent clothing in daylight reflective clothing if you have to ride at night or in poor visibility

 Rule 51  At night. It is safer not to ride on the road at night or in poor visibility, but if you do, make sure you wear reflective clothing and your horse has reflective bands above the fetlock joints. A light which shows white to the front and red to the rear should be fitted, with a band, to the rider’s right arm and/or leg/riding boot. If you are leading a horse at night, carry a light in your right hand, showing white to the front and red to the rear, and wear reflective clothing on both you and your horse. It is strongly recommended that a fluorescent/reflective tail guard is also worn by your horse.