A compound of Formula : or a salt thereof, wherein; Xis N or CR 5 ; Y is N or CR 6 ; R 1 is H, C 1-6 alkyl optionally substituted with OH or 1 to 6 fluorine atoms, C 3-6 cycloalkyl optionally substituted with OH or 1 to 6 fluorine atoms, wherein when the C 1-6 alkyl or C 3-6 cycloalkyl group is not substituted with OH, one atom of the C 1-6 alkyl or C 3-6 cycloalkyl group may be optionally replaced by an O atom which is not directly attached to the N or attached to a carbon atom which is directly attached to the N; or R 1 is joined to R 2 to form a 4, 5, 6 or 7-membered ring which is optionally substituted with OH or 1 to 6 fluorine atoms; R 2 is H or C 1-3 alkyl optionally substituted with OH or 1 to 6 fluorine atoms; or R 2 is joined to R 1 to form a 4, 5, 6 or 7-membered ring which is optionally substituted with OH or 1 to 6 fluorine atoms; R 4 , R 5 and R 6 are independently selected from H, CN, halo, C 1-6 alkyl optionally substituted with OH or 1 to 6 fluorine atoms, C 3-6 cycloalkyl optionally substituted with OH or 1 to 6 fluorine atoms and C 1-6 alkoxy optionally substituted with 1 to 6 fluorine atoms, wherein when the C 1-6 alkyl or C 3-6 cycloalkyl group is not substituted with OH, one atom of the C 1-6 alkyl or C 3-6 cycloalkyl group may be optionally replaced by O; R 3 is a group of the formula: or L is CH 2 or CHOH; the group: is R 8 , R 9 and R 10 are independently selected from H, CN, halo, C 1-6 alkyl optionally substituted with 1 to 6 fluorine atoms and C 1-6 alkoxy optionally substituted with 1 to 6 fluorine atoms, wherein one atom of the C 1-6 alkyl group may be optionally replaced by a heteroatom selected from O, N, S and oxidised forms thereof. Xis N or CR 5 ; Y is N or CR 6 ; R 1 is H, C 1-6 alkyl optionally substituted with OH or 1 to 6 fluorine atoms, C 3-6 cycloalkyl optionally substituted with OH or 1 to 6 fluorine atoms, wherein when the C 1-6 alkyl or C 3-6 cycloalkyl group is not substituted with OH, one atom of the C 1-6 alkyl or C 3-6 cycloalkyl group may be optionally replaced by an O atom which is not directly attached to the N or attached to a carbon atom which is directly attached to the N; or R 1 is joined to R 2 to form a 4, 5, 6 or 7-membered ring which is optionally substituted with OH or 1 to 6 fluorine atoms; R 2 is H or C 1-3 alkyl optionally substituted with OH or 1 to 6 fluorine atoms; or R 2 is joined to R 1 to form a 4, 5, 6 or 7-membered ring which is optionally substituted with OH or 1 to 6 fluorine atoms; R 4 , R 5 and R 6 are independently selected from H, CN, halo, C 1-6 alkyl optionally substituted with OH or 1 to 6 fluorine atoms, C 3-6 cycloalkyl optionally substituted with OH or 1 to 6 fluorine atoms and C 1-6 alkoxy optionally substituted with 1 to 6 fluorine atoms, wherein when the C 1-6 alkyl or C 3-6 cycloalkyl group is not substituted with OH, one atom of the C 1-6 alkyl or C 3-6 cycloalkyl group may be optionally replaced by O; R 3 is a group of the formula: or L is CH 2 or CHOH; the group: is R 8 , R 9 and R 10 are independently selected from H, CN, halo, C 1-6 alkyl optionally substituted with 1 to 6 fluorine atoms and C 1-6 alkoxy optionally substituted with 1 to 6 fluorine atoms, wherein one atom of the C 1-6 alkyl group may be optionally replaced by a heteroatom selected from O, N, S and oxidised forms thereof. <EOS>