Legrand Synergy 730153 Pack of 50 Screw Cap Covers White - John Cribb & Sons Ltd, UK Electrical Distributors, Dorset, Hampshire, Wiltshire, Somerset & the Isle of Wight.
British General 8SC10 Screw Cap Covers for BG Nexus Moulded Wiring Accessories (Pack of 10) - John Cribb & Sons Ltd, UK Electrical Distributors, Dorset, Hampshire, Wiltshire, Somerset & the Isle of Wight.
Wickes Plastic Screw Cover Caps - White Pack of 10 | Wickes.co.uk
4-5mm Matt Snap Caps (Panhead Washer) | ScrewCoverCaps