Union Jack
British national flag is called "Union Jack". It symbolises the Union of England, Scotland and Ireland and dates back from 1801. The flag is made up of the crosses of the patron saints of England (St George's red cross on a white field), Ireland (St Patrick's red diagonals on a white field) and Scotland (St Andrew's white diagonals on a blue field). Wales is not represented because when the flag first appeared it was already united with England. The design and colours (especially the Blue Ensign) have been the basis for a number of other flags including other Commonwealth countries and their constituent states or provinces, as well as British overseas territories.
National anthem is "God Save The Queen". Each part of the UK has its own symbol:
•England - red rose
•Ireland - shamrock
•Wales - leek, daffodil
•Scotland - thistle

The flag of the United Kingdom, the Union Jack, is a superposition of the flags of Saint George(for England), Saint Andrew (for Scotland) and Saint Patrick (for Ireland). This superposition is quite intricate, and often drawn incorrectly. The next diagram shows the correct construction.

National Anthem
God save the Queen

God save our gracious Queen,
Long live our noble Queen,
God save the Queen:
Send her victorious,
Happy and glorious,
Long to reign over us:
God save the Queen.

O Lord our God arise,
Scatter her enemies,
And make them fall:
Confound their politics,
Frustrate their knavish tricks,
On Thee our hopes we fix:
God save us all.