What do people decorate the house with on birthdays in Britain?

In the UK, houses are often decorated with flags, balls and a party in the yard. There the British arrange a barbecue and the call of their neighbors, loud music is heard, everyone celebrates

People in Britain like to decorate their houses on birthdays. First of all they decorate the trees in the garden and the front door of the house with different lights.

They do many decorations indoors. There are many balloons, posters and photo collages in the rooms. Sometimes they prepare a surprise box with unusual or funny presents.