Communications chief Tim Allan left Strand Partners in September but still holds a minority stake

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No 10 is facing calls for an investigation into whether Keir Starmer’s communications chief should be allowed to hold shares in a lobbying firm and discuss politics with one of its consultants.

Tim Allan, who is one of Starmer’s most senior aides, has a minority stake in Strand Partners, which critics claim could give rise to a perception of a conflict of interest.

Allan does not gain any financial benefit from Strand while he is in No 10 but he has not sold his shares in the firm, whose clients include the British Horseracing Authority, the energy companies Ovo Energy and Cadent Gas, and Netflix.