I have an iron-clad rule that any movie with slo-mo is a dog.
It's usually a bad sports-themed movie that needs slo-mo to make things seem more dramatic than they really are.
It could be a romantic movie where two lovers ran slo-mo across a beach toward each other's out-stretched arms.
In this case it's two lovers playing a sport (ping-pong) over the opening credits.
And sure enough, the movie is a bowzer.
Especially laughable is watching two members of the Elvis Presley generation cavorting to faux rock & roll. There's a little fake Beatles (OK, Ravi Shankar) and some fake Led Zeppelin, and who knows what else.
Susannah York is as inert is radon. At certain points I thought Michael Caine was about to fall asleep. At least Liz games it up in that fright wig. She deserved better material.