Exterior Decking: Supplying the finest Exterpark Hardwood Decking and Millboard Replica Wood Decking products. A premium decking design, supply and installation service throughout the UK. Hardwood Decking supplier for the UK based in Amersham, Buckinghamshire. Largest selection of hardwood decking available to include, Ipe, Teak, Massaranduba, Kebony, Merbau, Kurupay, Cumaru, Elondo. Exterpark hardwood decking is considered by many to be the highest quality hardwood available in the UK, and the invisible screw system leaves a fabulous interior-quality finish.