The Queen watches a First Aid display by Cadets at The Great Party to celebration St John Ambulance's 100th anniversary
Queen Elizabeth II attended 'The Great Party', St John Ambulance's centenary event in Hyde Park in 1987. Accompanied by The Duke of Edinburgh and The Duke and Duchess of Gloucester, she toured the party and spoke to many who had turned out for the celebration. In this photograph, she watches a demonstration of first aid by St John Ambulance Cadets.