I'm probably guilty of non-RP pronunciation here (references please, people! I know this has been well covered before.) but my pronunciations would be as follows:

veterinary: vet-RIN-ur-ee
colliery: COL-yur-ee
arbitrarily: ar-bih-TREHR-ih-lee
(but arbitrary: AR-bih-tree)

No doubt a spotless example of the Queen's English.