The use of a compound of formula I Y is a single bond, C&boxH；O, C&boxH；S or S(O)m m where m is 0, 1 or 2； the ring represented by T is a 5 or 6 membered heteroaromatic and R1, R2, R3, R8 and Ra are specified organic groups and p is 0, 1, 2, 3, 4, 5 or 6； q is 0, 1, 2, 3, 4, 5 or 6； p+q is 1, 2, 3, 4, 5 or 6； or salts or N-oxides thereof or compositions containing them in controlling insects, acarines, nematodes or molluscs； novel compounds are also provided.
