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I'd be asking for him to top it up. That's closer to half a pint than a pint.
The photo has, it transpires, been doctored. In the original, the glass is full, and the young woman behind him is not glancing suspiciously sideways at him. https://www.theguardian.com/politics/2023/aug/02/labour-mp-criticised-for-sharing-doctored-image-of-rishi-sunak