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NotThamesWater-
Cladco composite. Was going to get the hollow variety after a little visit to my neighbours house who has the solid variety, I was impressed enough to think the premium would be worth it. Feels solid and looks good. More possibilities if you want to go for a picture frame / notch boards out for whatever reason / router fun.
https://www.wpc-decking.co.uk/4m-solid-commercial-grade-composite-decking-board
Hovis
I'm building a deck for my garden office and am wondering about a slope for drainage. The boards will be grooved composite and run parallel to the office. I was going to have it slope slightly away from the office ie perpendicular as the garden naturally slopes anyway, but am wondering if I will have a standing water problem in the grooves since they will be level in their orientation? I don't really want to introduce a slope in that direction as it would be an eye sore.