A giant street party with 10,000 guests celebrating the Queen's 90th birthday will take place on the Mall in central London on Sunday.

The Queen is the patron of more than 600 charities and organisations, and many of the guests work for her charities.

Among the guests invited to the lunch is Sarah Dell, a volunteer for the Friends of the Elderly charity.

BBC News joined Sarah ahead of the Patron's Lunch to see her at work.