Abstract: the present invention provides a compound of formula (I): wherein V represents NR5, O, S, SO or S(O)2; W and X each independently represent CH or N; Y represents N, CH or C—Ar2, with the proviso that at least one, but no more than two, of W, X and Y are N; Z represents CH or C—Ar2, with the proviso that when Y is N or CH then Z is C—Ar2, and with the further proviso that when Y is C—Ar2 then Z is CH; Ar1 represents a fused 9 or 10 membered heterobicyclic ring system containing one, two, three or four heteroatoms selected from nitrogen, oxygen and sulfur, wherein at least one of the rings in said ring system is aromatic; Ar2 represents an aromatic ring selected from phenyl, pyridyl, pyrimidinyl and pyridazinyl which is optionally fused and substituted; R1 represents halogen, hydroxy, oxo, C1-6alkyl, C2-6alkenyl, C2-6alkynyl, haloC1-6alkyl, hydroxyC1-6alkyl, C1-6alkoxy, haloC1-6alkoxy, hydroxyC1-6alkoxy, C3-7cycloalkyl, C3-7cycloalkoxy, C3-5cycloalkylC1-4alkyl, cyano, nitro, SR6, SOR6, SO2R6, COR6, NR3COR6, CON