UK Prime Minister David Cameron ignored advice from his Conservative colleagues, many religious leaders and even his own mother on same-sex marriage, a book has claimed.

According to Lord Ashcroft’s biography, Call Me Dave, he ignored ‘universal advice’ to stop his support for same-sex marriage.

The marriage bill was initially suggested by the Liberal Democrats, supported by Cameron and a minority of the Conservative party, and passed in parliament thanks to overwhelming support from Labour. The first gay couples got married in England and Wales in March 2014.

Mary Cameron, the Prime Minister’s mother, has apparently said that even she tried to tell her son to drop the issue.

When asked about the negative reaction to the idea from Tory voters, she said: ‘I know, but David just won’t be told’.

Former Conservative donor Lord Ashcroft’s Call Me Dave has been making headlines ever since it started being serialized in the Daily Mail.

Previous revelations include a claim that Cameron stuck a part of his anatomy into a dead pig’s mouth while he was a university student. However, this claim has been highly contested and not proven. The prime minister’s spokesperson has refused to comment on any of the allegations in Ashcroft’s biography.