The present disclosure relates to (thio)morpholine derivatives of the formula (I), wherein R1 is selected from cyano, (2-4C)alkynyl, (1-4C)alkyl, (3-6C)cycloalkyl, (4-6C)cycloalkenyl, (6-8C)bicycloalkyl, (8-10C)bicyclic group, each optionally substituted with (1-4C)alkyl, phenyl, biphenyl, naphthyl, each optionally substituted with one or more substituents independently selected from halogen, (1-4C)alkyloptionally substituted with one or more fluoro atoms, (2-4C)alkynyl, (1-4C)alkoxy optionally substituted with one or more fluoro atoms,amino, di(1-4C)alkylamino, -SO2-(1-4C)alkyl, -CO-(1-4C)alkyl, -CO-O-(1-4C)alkyl, -NH-CO-(1-4C)alkyl and (3-6C)cycloalkyl, phenyl substituted with phenoxy, benzyl, benzyloxy, phenylethyl or monocyclic heterocycle, each optionally substituted with (1-4C)alkyl, monocyclic heterocycle optionally substituted with halogen, (1-4C)alkyl or with phenyl optionally substituted with (1-4C)alkyl, and bicyclic heterocycle optionally substituted with (1-4C)alkyl A is selected from -CO-O-, -O-CO-, -NH-CO-, -CO-NH, -C=C-, -CCH3-O- and the linking group -Y-(CH2)n-X- wherein Y is attached to R1 and selected from a bond, -O-, -S-, -SO-, -SO2-, -CH2-O-, -CO-, -O-CO-, -CO-O-, -CO-NH-, -NH-CO-, -C=C-and -C?C- n is an integer from 1 to 10 and X is attached to the phenylene / pyridyl group and selected from a bond, -O-, -S-, -SO-, -SO2 -, -NH, -CO-, -C=C-and -C?C- ring structure B optionally contains one nitrogen atom R2 is H, (1-4C)alkyl optionally substituted with one or more fluoro atoms, (1-4C)alkoxy optionally substituted with one or more fluoro atoms, or halogen and R3 is (1-4C)alkylene-R5 wherein the alkylene group may be substituted with (CH2)2 to form a cyclopropyl moiety or one or two halogen atoms, or R3 is is (3-6C)cycloalkylene-R5 or -CO-CH2-R5, wherein R5 is -OH, -PO3H2, -OPO3H2, -COOH, -COO(1-4C)alkyl or tetrazol-5-yl R4 is H or (1-4C)alkyl R6 is one or more substituents independently selected from H, (1-4C)alkyl or oxo W is -O-, -S-, -SO- or -
