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NotThamesWater
@ColinTheBald
Getting there. I go 600mm deep and use a bag of ballast per hole, but people can sue me. You will need at least 3 bags of ballast, probably 4, one cement is enough. 2x8' 4x4 posts will do you, each cut in 3 to provide 6 posts, sawn and treated fence posts are fine . You're now on overkill for the 4x2, 1x4.8 and 3x3.o will be enough for 2.4m x 1.5m surface. Don't forget the decking screws, you need 200.