Conservative MP Bob Blackman, who previously had an affair behind his wife’s back for 11 years, says legalising equal marriage would make it “difficult to promote Christian values in parliament.”

The MP was exposed as a love cheat late last year by his former mistress Carol Shaw, a councillor in Brent, north-west London, who was incensed with Mr Blackman’s ‘hypocritical’ anti-gay comments.

In December, the Harrow East MP for north-west London responded to David Cameron’s support for religious same-sex marriages in England and Wales by suggesting the prime minister should resurrect Section 28, a notorious piece of anti-gay legislation passed under the Thatcher government.

The MP, who is part of the Westminster Declaration Christian group, has now told the Harrow Observer:

“If this went ahead it would be difficult to promote Christian values in parliament. I also make a point to promote religious values in my constituency.

“Marriage is for man and woman, and for same-sex couples there is a legal partnership. It certainly angers religious groups and constituents, many of whom have contacted me.”

However, the leader of a synagogue in Mr Blackman’s constituency has warmly-welcomed the government’s marriage reforms.

Rabbi Aaron Goldstein, of Northwood and Pinner Liberal Synagogue, said: “This is a huge change for us, as well as a huge surprise. It is what we want, which is the right to be able to perform marriages for loving couples regardless of their sexuality.

“The important point is the distinction it makes between civil partnerships – it will allow gay and lesbian couples to be married in the synagogue and have their marriage blessed by God.”

Gareth Thomas, Labour MP for Harrow West, added: “I believe that same-sex couples should have the chance to marry and have their relationship recognised as being of equal worth to other loving couples.”

Barry Gardiner, Labour MP for neighbouring Brent North and a member of the Church of England, said: “What the government should be saying on this is that any priest or rabbi or imam who wants to conduct marriages for gay couples, in compliance with their own church, should be able to go ahead and do so, instead they have put a quadruple lock on the Church of England being able to allow them.

“Change happens and in the Church of England we have moved with some changes, but my views on this go back 35 or 40 years. I have always been in favour of having gay marriage and recognising it in church.”

The equal marriage bill is expected to be published by the government in the next few weeks.