Love and Pain and the Whole Damn Thing (1973)

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While bicycling through the Spanish countryside, Walter, the aimless young son of a doctor, makes the acquaintance of proper, middle-aged, clumsy and secretive Lila. He falls in love with her, but she is resistant.

Maggie Smithas Lila Fisher
Timothy Bottomsas Walter Elbertson
Don Jaime de Mora y Aragónas The Duke (as Don Jaime de Mora y)