Shadow foreign secretary David Lammy is to be investigated by the parliamentary standards commissioner for allegedly breaching rules over reporting earnings and gifts.
The probe was confirmed in an update by Commissioner Kathryn Stone on the UK Parliament website.
Under the MPs’ code of conduct, members must register any extra wages or hospitality within 28 days of receiving them.
But it is understood the shadow foreign secretary missed the deadline.
A spokesperson for Mr Lammy apologised for “administrative errors” in his office, which they said led to late declarations in December 2021.
They said the MP for Tottenham had “assured the registrar that he has put revised systems in place so that declarations are made in a timely manner”, adding: “We are happy to provide the parliamentary standards commissioner with any further information.”
As well as his role in the shadow cabinet, Mr Lammy regularly hosts a show on LBC, and performs a range of speaking engagements.
His most recent declaration on the register of members’ financial interests also included a trip to the US to make a speech on Ukraine, costing £3,726.88 and paid for by Tufts University.
This latest investigation follows similar allegations against Labour leader Sir Keir Starmer, who is also being investigated over late declarations.
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Starmer also under investigation by the parliamentary standards commissioner
Sir Keir has insisted he was “absolutely confident” he had not broken the rules, also blaming “administrative errors” in his office.
Meanwhile, the Labour leader is also being investigated by police over whether COVID rules were broken during an event in April 2021, when he was filmed having a drink and a takeaway curry.
The Labour leader has said he will resign if he is fined over the event.