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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AlphaBay, where illegal items including drugs were traded, is one of two dark web markets seized after an US and Europe-led operation.
Sir Vince Cable has become the new leader of the Liberal Democrats, after no other nominations were put forward.