Gay marriage has become legal in Britain after the bill was granted Royal Assent by the Queen.
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David Cameron has addressed Parliament for the first time since Britain voted to leave the European Union.
The FTSE 100 Index fell to 2.55% to 5,982.2 at the closing bell as the financial markets continued to experience Brexit volatility.
Prime Minister David Cameron has called his Polish counterpart, Beata Szydło, to express concern over reported attacks on Polish migrants.