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Cool just let me know. I have a large mitre saw so it's no bother to cut to spec.
These boyos - http://www.wickes.co.uk/Wickes-Exterior-Grade-Joist---47-x-150mm-x-3m/p/101318
Although I swear mine are marked C24. I also have some glavanised joist hangers left over for them that are taking up space in the shed.
It will depend on how old it is but it could be pressure treated. See if there are any markings on the timber. C16 or C24 would be a good sign.
Alternatively, I have some left over 3m or so long C24 6" x 2" joists left over from building the deck that have been stored under tarp since last April that you're welcome to for a fiver each if you can collect from SE19. I can cut them to length if it makes it easier to transport.