Inspector Wexford - The Speaker of Mandarin

From the VHS cover:
To his utter astonishment, Chief Inspector Reg Wexford experiences some bizarre psychic sensations - like a vision of the corpse of the Marquise of Lai, dead for 2,000 years: while on an official visit to China. His sight-seeing party is made up of disparate strangers yet he feels a strange tension and claustrophobic atmosphere in their midst.
On his return to England, Wexford is called to the scene of a murder - that of a woman who was, by strange coincidence, on the Chinese sight-seeing trip....