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Thanks Sumo, I gave that a slightly less than thorough read but will return to it later.
A fair summary would seem to be that there is very little weight difference between tubed and tubeless, but I'm only giving up about 2 Watts of rolling resistance on the 'fast' tyres I normally use (I don't care about my winter tyres as I convince myself they add extra training).
http://www.bicyclerollingresistance.com/specials/road-bike-tubeless-sealant