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@Sainsburys_Ed
whilst a double fixed cog does seem like a good idea in theory, its pretty pointless.
you would end up with two cogs with dodgy chainlines, they may not be out by enough to cause a 'problem' it would almost certainly create a noisy drivetrain, and secondly with a double fixed hub you can flip the wheel round just as easily. you'll need to carry the tool to remove your rear wheel anyway to repair punctures, and you'd have to handle the chain eitherway so your hands will get dirty.
go for double fixed as well, as it's possible to run a freewheel on threads for a fixed cog but not the other way round!