Gay rights campaigner Peter Tatchell has reminded Sarah Brown, the prime minister’s wife, that gays cannot get married.

She marched in the Pride parade with Stonewall chief Ben Summerskill and gay MEP Michael Cashman as she waved a pink Union flag.

Carrying a placard reading ‘Gordon and Sarah can marry, gays can’t’, Tatchell approached her to thank her for attending the march.

He told PinkNews.co.uk: “I walked with Sarah Brown and thanked her for her presence today. I reminded her that although she and Gordon were able to get married, gays cannot. Civil partnerships were an important advance but they are not equal. Sarah nodded and said thank you.”

Tatchell had previously promised he would be on his “best behaviour” at the march.