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It has recently been argued that codimension-two braneworlds offer apromising line of attack on the cosmological constant problem, since in suchmodels the Hubble rate is not directly related to the brane tension. We pointout challenges to building more general models where the brane content is notrestricted to pure tension. In order to address these challenges, we constructa thick brane model which we linearize around a well known static solution. Weshow that the model's cosmology does reduce to standard FRW behaviour, but findno hint of a self-tuning mechanism which might help solve the cosmologicalconstant problem whithin the context of non-supersymmetric Einstein gravity.Comment: 8 pages, talk given at MRST 2004: From Quarks to Cosmology, Concordia  University, Montreal, May 200

GENERALISED COSMOLOGY OF CODIMENSION-TWO BRANEWORLDS