Labour leader Ed Miliband's Prime Minister's Questions briefing notes were left in a toilet in Commons, the BBC reports.
According to political correspondent Norman Smith, they contained pre-prepared lines to rebuff David Cameron over a row about Labour's candidate choice for Falkirk involving the Unite union.
The notes were also said to contain pre-emptive responses to any criticisms of Labour MP Tom Watson, including "I'll take Tom Watson over Andy Coulson any day".
Mr Smith said a Labour source admitted that Mr Miliband's parliamentary aide left the notes behind, quoting them saying "he left the chamber in a hurry!".
More top news
The 5,000 ecstasy pills had an estimated street value of £36,000.
Police say it is "too early" to know if the body is that of journalist Kim Wall, who is believed to have died on board an amateur submarine.
'I'm not a fan of the new pound coin, but then again, I hate all change'