The director for the Coalition for Marriage has handed a petition to Downing Street against plans to change laws to allow gay marriage.
Colin Hart told press outside No 10 that "the government should listen to the people" and to keep existing marriage legislation.
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Minister will fail to eliminate the gender pay gap in a generation if it continues to "ignore" evidence to help achieve its goal, MPs warn.
Report criticises ministers for lack of long term plan to recruit and retain teachers in important subjects such as physics and maths.