The Honours system has been at the centre of several high profile scandals, which have ranged from allegations of cronyism to bribery.
Following on from the claims David Cameron is pushing to reward personal aides, political donors and senior Remainers, here are a few other controversial instances:
David Lloyd George
The underhand actions of Britain's First World War prime minister led to a law change after he was caught selling peerages and other honours in the 1920s.
Lloyd George, who led the country from 1916 to 1922, sold honours to fill Liberal Party coffers, with a barony available for £50,000, a baronetcy for £25,000 and a knighthood for £15,000, all huge sums at the time.
The OBE was introduced in 1917 and dished out to people with less money so they could get some letters after their names. This led to it being mocked as the Order of The Bad Egg.
The Honours (Prevention of Abuses) Act 1925 made it a crime to reward with "title of honour" anyone who has given "any gift, money or valuable consideration". The only person convicted under the law was Lloyd George's "honours broker" Maundy Gregory, in 1933.
Wilson's resignation honours in 1976 were dubbed the Lavender List after the colour paper some of the names were later found written on. The handwriting was that of his secretary Marcia Williams, leading to the suspicion, but no more, that she was responsible for the list.
Names included a knighthood for Joseph Kagan who was later convicted of false accounting. Another honoured was Eric Miller, who committed suicide while his business was investigated. There was also a knighthood for Wilson's publisher, Sir George Weidenfeld.
Joe Haines, who was Wilson's press secretary, refused a peerage because he did not want to appear on a list alongside people "whom I regarded as undeserving".
Blair became the first serving prime minister to be interviewed - three times - by police as part of a political corruption inquiry in 2006 as detectives investigated the "cash-for-honours" controversy.
The probe followed a complaint by Scottish National Party MP Angus MacNeil that financial support was being rewarded with honours.
It had been reported that millionaires who gave large donations to the Labour and Conservative parties were to be given peerages.
In 2007, after a £1.4 million, 19-month investigation, the Crown Prosecution Service announced that nobody would be charged under the Honours (Prevention of Abuses) Act, as there was no realistic prospect of a conviction.
The Hayden Phillips Review was set up to discuss reforms, with recommendations including a cap on donations and more public funding. Cross-party talks broke down without agreement.