The Collaborative International Dictionary of English v.0.48:

flavourful \flavourful\ adj.
   same as flavorful. [Chiefly Brit.]

   Syn: flavorful, flavorous, flavourous, flavorsome,
        flavoursome, sapid, saporous.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

flavourful
    adj 1: full of flavor [syn: flavorful, flavourful,
           flavorous, flavourous, flavorsome, flavoursome,
           sapid, saporous]