Life at the Top (1965)

Successful businessman Joe Lampton is married to the wealthy Susan, has two children, and lives in the mill town of Warley in northern England. But his career seems to have plateaued, leaving him disillusioned. This feeling is only exacerbated when he discovers his wife's infidelity with local man Mark. So he takes up with attractive TV host Norah and moves with her to London, aiming to reignite the fire that drove him to the top.