Boris Johnson may be only witness called in Partygate investigation

Boris Johnson at a gathering for the departure of a special adviser, in a picture released with the publication of Sue's Gray report into Downing Street parties during lockdown. Photograph: Sue Gray Report/Cabinet Office/PA

Boris Johnson may be the only witness called by the privileges committee for its investigation into whether he misled parliament over Partygate, as the inquiry has rebuffed his lawyer’s request to give evidence alongside him.

The former prime minister is preparing to appear at a televised hearing on Wednesday. The length of the grilling will depend on how much he says.