A compound of formula: or a pharmaceutically acceptable salt, solvate or polymorph thereof, including all tautomers and stereoisomers thereof wherein: R 1 represents a phenyl ring fused to a 5-membered heteroaryl ring wherein R 1 is linked to the core of formula through the phenyl ring; Y represents a 5 membered heteroaryl group selected from triazolyl, thiadiazolyl, thiazolyl, triazol-one or triazol-thione; X represents a linker selected from -(CH 2) m -R 2, -(CH 2) n -S-R 2, -(CH 2) p -O-R 2 or - p -SO 2 -R 2; m represents an integer selected from 1 to 4; n represents an integer selected from 1 or 2; p represents the integer 1; R 2 represents C 6-12 aryl, C 6-12 heteroaryl or C 3-12 carbocyclyl; in which any of aforesaid C 6-12 aryl and C 6-12 heteroaryl groups may optionally be substituted by one or more groups selected from C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, -C 1-6 thioalkyl, -SOC 1-4 alkyl, -SO 2 C 1-4 alkyl, C 1-6 alkoxy-, -O-C 3-8 cycloalkyl, C 3-8 cycloalkyl, -SO 2 C 3-8 cycloalkyl, -SOC 3-6 cycloalkyl, C 3-6 alkenyloxy-, C 3-6 alkynyloxy-,-C C 1-6 alkyl, -C OC 1-6 alkyl, C 1-6 alkoxy-C 1-6 alkyl-, nitro, halogen, haloC 1-6 alkyl, haloC 1-6 alkoxy, cyano, hydroxyl, -C OH, -NH 2, -NHC 1-4 alkyl, -N(C 1-4 alkyl)(C 1-4 alkyl),-C N(C 1-4 alkyl)(C 1-4 alkyl), -C NH 2, -C NH(C 1-4 alkyl) and -C NH(C 3-10 cycloalkyl); and in which any of aforesaid C 3-12 carbocyclyl groups may optionally be substituted by one or more groups selected from C 1-4 alkyl, oxo, halogen and C 1-4 alkoxy; or R 2 represents phenyl substituted by phenyl, phenyl substituted by a monocyclic C 6-12 heteroaryl group, phenyl substituted by phenoxy, phenyl substituted by C 3-12 heterocyclyl, phenyl substituted by -O-C 1-4 alkyl- C 3-12 heterocyclyl, phenyl substituted by benzyloxy, phenyl fused to C 3-12 carbocyclyl or phenyl fused to C 3-12 heterocyclyl, such that when Y represents oxadiazolyl and X represents CH 2, R 2 represents a group other than phenyl substituted by phenoxy; in which any of aforesaid phenyl, benzyloxy and C 6-12 heteroaryl groups may optionally be substituted by one or more groups selected from C 1-4 alkyl, halogen and C 1-4 alkoxy, and in which any of aforesaid C 3-12 carbocyclyl and C 3-12 heterocyclyl groups may optionally be substituted by one or more groups selected from methyl, phenyl, oxo, halogen and C 1-4 alkoxy; with the proviso that the compound of formula is a compound other than: 6-(5-(2,3-dimethoxyphenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine; 6-(5-(4-(methylthio)phenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine; or 6-(5-(2-chloro-3-methoxyphenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine. R 1 represents a phenyl ring fused to a 5-membered heteroaryl ring wherein R 1 is linked to the core of formula through the phenyl ring; Y represents a 5 membered heteroaryl group selected from triazolyl, thiadiazolyl, thiazolyl, triazol-one or triazol-thione; X represents a linker selected from -(CH 2) m -R 2, -(CH 2) n -S-R 2, -(CH 2) p -O-R 2 or - p -SO 2 -R 2; m represents an integer selected from 1 to 4; n represents an integer selected from 1 or 2; p represents the integer 1; R 2 represents C 6-12 aryl, C 6-12 heteroaryl or C 3-12 carbocyclyl; in which any of aforesaid C 6-12 aryl and C 6-12 heteroaryl groups may optionally be substituted by one or more groups selected from C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, -C 1-6 thioalkyl, -SOC 1-4 alkyl, -SO 2 C 1-4 alkyl, C 1-6 alkoxy-, -O-C 3-8 cycloalkyl, C 3-8 cycloalkyl, -SO 2 C 3-8 cycloalkyl, -SOC 3-6 cycloalkyl, C 3-6 alkenyloxy-, C 3-6 alkynyloxy-,-C C 1-6 alkyl, -C OC 1-6 alkyl, C 1-6 alkoxy-C 1-6 alkyl-, nitro, halogen, haloC 1-6 alkyl, haloC 1-6 alkoxy, cyano, hydroxyl, -C OH, -NH 2, -NHC 1-4 alkyl, -N(C 1-4 alkyl)(C 1-4 alkyl),-C N(C 1-4 alkyl)(C 1-4 alkyl), -C NH 2, -C NH(C 1-4 alkyl) and -C NH(C 3-10 cycloalkyl); and in which any of aforesaid C 3-12 carbocyclyl groups may optionally be substituted by one or more groups selected from C 1-4 alkyl, oxo, halogen and C 1-4 alkoxy; or R 2 represents phenyl substituted by phenyl, phenyl substituted by a monocyclic C 6-12 heteroaryl group, phenyl substituted by phenoxy, phenyl substituted by C 3-12 heterocyclyl, phenyl substituted by -O-C 1-4 alkyl- C 3-12 heterocyclyl, phenyl substituted by benzyloxy, phenyl fused to C 3-12 carbocyclyl or phenyl fused to C 3-12 heterocyclyl, such that when Y represents oxadiazolyl and X represents CH 2, R 2 represents a group other than phenyl substituted by phenoxy; in which any of aforesaid phenyl, benzyloxy and C 6-12 heteroaryl groups may optionally be substituted by one or more groups selected from C 1-4 alkyl, halogen and C 1-4 alkoxy, and in which any of aforesaid C 3-12 carbocyclyl and C 3-12 heterocyclyl groups may optionally be substituted by one or more groups selected from methyl, phenyl, oxo, halogen and C 1-4 alkoxy; with the proviso that the compound of formula is a compound other than: 6-(5-(2,3-dimethoxyphenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine; 6-(5-(4-(methylthio)phenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine; or 6-(5-(2-chloro-3-methoxyphenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine. 6-(5-(2,3-dimethoxyphenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine; 6-(5-(4-(methylthio)phenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine; or 6-(5-(2-chloro-3-methoxyphenethyl)-1,3,4-thiadiazol-2-yl)H-imidazo[1,2-a]pyridine.