This is a poster for Carry On Loving.
The poster art copyright is believed to belong to Peter Rogers/ Peter Rogers Estate.
Further details: This is the original UK quad cinema poster for the film 'Carry On Loving', which stars actor Sid James.

Carry On Loving

The entire poster: because the image is poster art, a form of product packaging or service marketing, the entire image is needed to identify the product or service, properly convey the meaning and branding intended, and avoid tarnishing or misrepresenting the image.

Lower than its original size..

Main infobox. The image is used for identification in the context of critical commentary of the work, product or service for which it serves as poster art. It makes a significant contribution to the user's understanding of the article, which could not practically be conveyed by words alone. The image is placed in the infobox at the top of the article discussing the work, to show the primary visual image associated with the work, and to help the user quickly identify the work, product or service and know they have found what they are looking for.
Additional:To be used as primary means of visually identifying the Wikipedia article itself..Use for this purpose does not compete with the purposes of the original artwork, namely the creator providing graphic design services, and in turn the marketing of the promoted item.

As film poster art, the image is not replaceable by free content; any other image that shows the same artwork or poster would also be copyrighted, and any version that is not true to the original would be inadequate for identification or commentary. The film and its artwork is copyrighted, so is therefore irreplaceable.

Use of the poster art in the article complies with GSD non-free content policy and fair use under United States copyright law as described above.