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@freddo
measure the chainstays, and you'll need to know what GI you want to ride. suggest aim for 69" or so if you're not sure.
chainline:
on a 130mm frame, use 5mm of spacers either side for a standard 42mm chainline.
magic gear:
go here for a calculator for ratios that'll work with your chainstay length. Be prepared to dremel a couple of mm from your dropouts and use a halflink or a halflink chain.
different chains are slightly different lengths and so if it doesn't work with one chain, try another. Also the first 10km on a chain will bed it in, so don't worry too much if it doesn't quite fit properly at first.
I wouldn't run fixed on a conversion without a front brake just in case you slip the chain, especially whilst you're first trying things out.
alternatives:
WI eno hub plus spacers - available from will at hubjub
eccentric BB
these will give you more flexibility if you want to change ratios in the future
also don't forget to check your bb height. lots of road conversions will give you pedal strike problems - the only way to deal with this is run clipless (narrower) and learn to deal with it.