The invention provides compounds of formula (I): ##STR00001## wherein A and B represent the groups --(CH.sub.2).sub.m-- and --(CH.sub.2).sub.n-- respectively; R.sup.1 represents hydrogen or C.sub.1-6alkyl; R.sup.2 represents hydrogen, halogen, hydroxy, cyano, nitro, hydroxyC.sub.1-6alkyl, trifluoromethyl, trifluoromethoxy, C.sub.1-6alkyl, C.sub.1-6alkoxy, C.sub.1-6fluoroalkoxy, --(CH.sub.2).sub.pC.sub.3-6cycloalkyl, --(CH.sub.2).sub.pOC.sub.3-6cycloalkyl, --COC.sub.1-6alkyl, --SO.sub.2C.sub.1-6alkyl, --SOC.sub.1-6alkyl, --S--C.sub.1-6alkyl, --CO.sub.2C.sub.1-6alkyl, --CO.sub.2NR.sup.5R.sup.6, --SO.sub.2NR.sup.5R.sup.6, --(CH.sub.2)NR.sup.5R.sup.6, --(CH.sub.2).sub.pNR.sup.5COR.sup.6, optionally substituted aryl ring, optionally substituted heteroaryl ring or optionally substituted heterocyclyl ring; R.sup.3 represents hydrogen, halogen, hydroxy, cyano, nitro, hydroxyC.sub.1-6alkyl, trifluoromethyl, trifluoromethoxy, C.sub.1-6alkyl, C.sub.1-6alkoxy, C.sub.1-6fluoroalkoxy, --(CH.sub.2).sub.pC.sub.3-6cycloalkyl, --(CH.sub.2).sub.pOC.sub.3-6cycloalkyl, --COC.sub.1-6alkyl, --SO.sub.2C.sub.1-6alkyl, --SOC.sub.1-6alkyl, --S--C.sub.1-6alkyl, --CO.sub.2C.sub.1-6alkyl, --CO.sub.2NR.sup.7R.sup.8, --SO.sub.2NR.sup.7R.sup.8, --(CH.sub.2).sub.pNR.sup.7R.sup.8 or --(CH.sub.2).sub.pNR.sup.7COR.sup.8; R.sup.4represents hydrogen, hydroxy, C.sub.1-6alkyl, C.sub.1-6alkoxy, C.sub.1-6fluoroalkoxy, trifluoromethyl, trifluoromethoxy, halogen, --OSO.sub.2CF.sub.3, --(CH.sub.2).sub.pC.sub.3-6cycloalkyl, --(CH.sub.2).sub.qOC.sub.1-6alkyl or --(CH.sub.2).sub.pOC.sub.3-6cycloalkyl; R.sup.5 and R.sup.6 each independently represent hydrogen, C.sub.1-6alkyl or, together with the nitrogen or other atoms to which they are attached, form an azacycloalkyl ring or an oxo-substituted azacycloalkyl ring; R.sup.7 and R.sup.8 each independently represent hydrogen or C.sub.1-6alkyl; m and n independently represent an integer selected from 1 and 2; p independently represents an integer selected from 0, 1, 2 and 3; q independently represents an integer selected from 1, 2 and 3; or a pharmaceutically acceptable salt or solvate thereof, with the proviso that the compounds 8-hydroxy-3-methyl-7-phenylsulfonyl-2,3,4,5-tetrahydro-1H-3-benzazepine, 8-hydroxy-7-4-(hydroxyphenyl)sulfonyl-2,3,4,5-tetrahydro-1H-3-benzazepine- , 7-phenylsulfonyl-1,2,3,4-tetrahydroisoquinoline and 7-phenylsulfonyl-1,2,3,4-tetrahydroisoquinoline hydrochloride are excluded.The compounds are useful in therapy, in particular as antipsychotic agents.