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3 joists per metre of width +1 to finish. 50 decking screws per square metre. Allow £10 for fabric beneath. For your size of decking 1 post per corner and one centrally on each side, plus one in the centre of the joist nearest to the centre of the decking. Allow probably 100 structural screws, stainless steel, 90mm by 6. Buy your screws from Screwfix, cheaper than online. 1x 25kg bag of ballast per post, 1 bag of cement per 4 ballast. For joists find the best use of common timber lengths of 3.0, 3.6, 4.2 or 4.8m i.e. yours will be approx 2.2m, so 2 out of a 4.8. If your deck is more than 8" above ground allow for extra joist material and deck boards to clad the sides.
You won't get my deals, but presume about £2.50/m for 4×2 joists, £7/m for posts, £2.50/m for deck boards.
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ColinTheBald
hugo7
@ColinTheBald - is there a fagpacket materials cost calculation for decking?
It's a 3.5m x 2.3m area. I can work out the boards, but just thought you might have an intuitive grasp of what the screws, subfloor, wastage, etc. usually run out to.