Dear Rebecca
I would suggest you contact some local carpentry or cabinet making companies, and see what they use. But if you are really stuck try http://www.leevalley.com/wood/page.asp?SID=x=1x=20073x= 1,190,42997
Although this is one of my favorite mail order companies for tools, the filler is about twice the price of the Le Pages. But at least it can be ordered from the mail. I just could not find a British wood finish supplier that had this kind of tinted water based filler. Your local paint store might be a good place to start also.
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As always your Most humble servant, Joseph, the Wood Floor Doctor.-