Three questions to answer what happens nextpublished at 17:15 BST 3 September
Who is the standards watchdog?
The independent adviser on ministerial standards advises the prime minister on the ministerial code - including investigating alleged breaches of conduct. They also advise ministers on managing their private interests, to avoid potential conflicts of interest. This position is currently held by Sir Laurie Magnus.
How will it investigate this case?
Downing Street has yet to set out the terms of reference for the inquiry. What we do know is that, once Magnus investigates Rayner's case, he can advise Starmer on whether he thinks there has been a breach of conduct. He can also make recommendations on the next course of action.
Who decides Rayner's future in government?
In her capacity as deputy prime minister and housing secretary, it'll ultimately be the prime minister who decides if Rayner can stay in office. But the prime minister cannot sack Rayner as deputy Labour leader. That's because she was elected into this role by the Labour party through a member vote, so only she can give that up.
Correction 4 September 2025: An earlier version of this post said the prime minister cannot sack Rayner as deputy prime minister. This has been corrected to say he cannot sack her as deputy party leader