A four-day celebration of events to mark the diamond jubilee of Britain's Queen Elizabeth has begun across the UK.

Dozens of street parties have also been planned across Northern Ireland.

The Queen attended the Epsom Derby at the beginning of the celebrations of her reign.

However, unlike last year's race she did not have a horse entered in the Derby, or the other six featured races.

But she presented the winning prizes in the renamed Diamond Jubilee Coronation Cup.

The 25-year- old Princess Elizabeth became Queen on the death of her father King George VI in 1952 and was crowned at Westminster Abbey the following year.

Polls suggest support for the monarchy in Britain is high, helped by last year's wedding of Prince William and Kate Middleton.

The extended Bank Holiday weekend will feature a River Thames pageant tomorrow, the following day pop music legends will entertain the royals and jubilee beacons will light up hilltops across the UK.

There will be a carriage procession, a flypast and a service of thanksgiving at Saint Paul's Cathedral on Tuesday.