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@BenH
Be careful with the crank extractor; it's easy to bugger the threads (aluminium, very shallow threads). A good dousing with WD40 followed by 2 litres of boiling water poured slowly over helped me get off a stuck crank by hitting it with a hammer. Obviously, this isn't a good idea if you want to reuse the cranks.
Bear in mind that (by the looks of it; I've been wrong before) your chainset is riveted. You can remove chainrings by cutting them off if you really want to, but that will probably weaken the whole thing; not a good idea if you're riding fixed. To be honest, you might be better off getting down your LBS and seeing if they've got any cranks with removable rings lying around you can have for cheap.