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@duckers
A headset reducer may be your best bet:
http://www.jensonusa.com/!Gvrd1Hq7g46NMxYdzs-Blw!/Problem-Solvers-Headtube-Reducer?cu=GBP
http://www.sjscycles.co.uk/headset-reducers-alloy-black-prod23588/
Never used them myself to know how effective they are, and I expect you'll need to use different forks too. Otherwise there are a few 1 1/4" headsets on ebay.com.