It looks like composite decking. We have a very similar composite decking in our Oak colour. The boards are waterproof and weather proof. Please feel free to get in touch with one of our team for more information. https://www.envirobuild.com
Hi, sorry for taking so long with an answer, I've just heard back from the architect.
Millboard decking - there is a whole range of colours and finishes. The company name is Millboard and the supplier was Woodstock in Penryn, Cornwall, UK.
Simon Burt Photography
EnviroBuild
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