From midnight tonight same sex couple across England and Wales can enjoy full marriage ceremonies and the same rights as heterosexual couples.
The govenment's legislation came into force last July and couple's were able to register their intention to marry under the act on March 13.
A number of couple's are bidding to become the first ever to be married in Britain by trying to time it so their vows are said just seconds after midnight.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.