A compound of Formula: or a salt thereof, wherein; A is selected from: Q is CN or a group of formula: X is a C 1-6 saturated or unsaturated hydrocarbon group optionally substituted with 1 to 6 fluorine atoms or X is joined with R 9 to form a C 3-6 cycloalkyl ring which is optionally substituted with 1 to 3 fluorine atoms or 1 to 3 C 1-3 alkyl groups; Y is O or NOR 16; T 1 is CR 8 or N; T 2 is CR 7 or N; T 3 is CR 6 or N; T 4 is CR 5 or N; T 5 is CR 4 or N; Z is a 5- or 6-membered heterocyclic ring optionally substituted with oxo or 1 to 6 fluorine atoms, or Z is C 3-6 cycloalkyl optionally substituted with 1 to 6 fluorine atoms, or Z is -(CH 2) p CONHR 13, or Z is -(CH 2) p CO 2 R 13; L is -CR 11 =CR 12 -, -CHR 11 -CHR 12 - or -O-CHR 11 -; R 1 and R 1a are independently H or a C 1-6 saturated hydrocarbon group optionally substituted with 1 to 6 fluorine atoms, or R 1 and R 1a are linked together to form a 3 to 6-membered saturated ring optionally containing an additional heteroatom; R 2 and R 3 are independently H or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; R 4, R 5, R 6, R 7 and R 8 are independently H, halo, CN, CO 2 R 14, OR 14, SO 2 R 14, SONHR 14, OSO 2 R 14, PO(R 14) 2, SF 5 or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; R 9 is H or is joined with X to form a C 3-6 cycloalkyl ring which is optionally substituted with 1 to 3 fluorine atoms or 1 to 3 C 1-3 alkyl groups; R 11 and R 12 are independently H, -(CH 2) m CO 2 R 15 or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; or R 11 and R 12 are joined to form a cyclopropyl ring; R 13, R 14 and R 15 are independently H or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; R 16 is H or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; p and m are independently 0-3; wherein when R 1 and R 1a are not both H, L is: -CHR 11 -CHR 12 -; -CR 11 =CR 12 - where R 3, R 4, R 5, R 6, R 7 and R 8 are not all H; or -O-CHR 11 - where R 3 is not H, or where two or more of R 4, R 5, R 6, R 7 and R 8 are not H. A is selected from: Q is CN or a group of formula: X is a C 1-6 saturated or unsaturated hydrocarbon group optionally substituted with 1 to 6 fluorine atoms or X is joined with R 9 to form a C 3-6 cycloalkyl ring which is optionally substituted with 1 to 3 fluorine atoms or 1 to 3 C 1-3 alkyl groups; Y is O or NOR 16; T 1 is CR 8 or N; T 2 is CR 7 or N; T 3 is CR 6 or N; T 4 is CR 5 or N; T 5 is CR 4 or N; Z is a 5- or 6-membered heterocyclic ring optionally substituted with oxo or 1 to 6 fluorine atoms, or Z is C 3-6 cycloalkyl optionally substituted with 1 to 6 fluorine atoms, or Z is -(CH 2) p CONHR 13, or Z is -(CH 2) p CO 2 R 13; L is -CR 11 =CR 12 -, -CHR 11 -CHR 12 - or -O-CHR 11 -; R 1 and R 1a are independently H or a C 1-6 saturated hydrocarbon group optionally substituted with 1 to 6 fluorine atoms, or R 1 and R 1a are linked together to form a 3 to 6-membered saturated ring optionally containing an additional heteroatom; R 2 and R 3 are independently H or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; R 4, R 5, R 6, R 7 and R 8 are independently H, halo, CN, CO 2 R 14, OR 14, SO 2 R 14, SONHR 14, OSO 2 R 14, PO(R 14) 2, SF 5 or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; R 9 is H or is joined with X to form a C 3-6 cycloalkyl ring which is optionally substituted with 1 to 3 fluorine atoms or 1 to 3 C 1-3 alkyl groups; R 11 and R 12 are independently H, -(CH 2) m CO 2 R 15 or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; or R 11 and R 12 are joined to form a cyclopropyl ring; R 13, R 14 and R 15 are independently H or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; R 16 is H or C 1-3 alkyl optionally substituted with 1 to 6 fluorine atoms; p and m are independently 0-3; wherein when R 1 and R 1a are not both H, L is: -CHR 11 -CHR 12 -; -CR 11 =CR 12 - where R 3, R 4, R 5, R 6, R 7 and R 8 are not all H; or -O-CHR 11 - where R 3 is not H, or where two or more of R 4, R 5, R 6, R 7 and R 8 are not H. -CR 11 =CR 12 - where R 3, R 4, R 5, R 6, R 7 and R 8 are not all H; or -O-CHR 11 - where R 3 is not H, or where two or more of R 4, R 5, R 6, R 7 and R 8 are not H.