Do Not Disturb (1965)

"What Should a Girl Do When Opportunity Knocks...Twice?"

American Mike Harper, sent to do business in England, moves there with his wife, Janet. But she soon becomes convinced that Mike is carrying on with his attractive new assistant, Claire. Mike also has been spending a considerable amount of time with his British bachelor buddies. Vexed and lonely, Claire hires charming antiques expert Paul to decorate the Harper home and maybe make Mike jealous in the process.