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@Shannonball
I've done this now, gone from flip flop to double fixed. Your cog winds on to the thread for the freewheel, nice and tight with a chain whip. Then you hold it down with a bottom bracket lockring, left winding, I believe. I got the lockring for £3 from Mosquito.
This has been a good excuse to drop from 48:18 to 48:19 and get spinning in London's Famous London's traffic.
DISCLAIMER: I run two brakes. If you are a skidder, this is probably not for you as the cog can unwind with the backward pressure on the pedals. See link to discussion above for details.