There will be a 41-gun salute in Hyde Park to mark the Queen's birthday.
The Queen famously has two birthdays every year (how did she manage to wangle that?), but this is her real one. I appreciate that it's impolite to discuss a lady's age, but she will be 91 years old this year. But I think you will agree with me when I say that she doesn't look a day over 85. (Especially if you look at her picture on the stamps.)
The gun salute will be fired by the King's Troop Royal Horse Artillery (KTRHA), and take place in the north-eastern corner of the park, a short distance from Speaker's Corner.
Be warned that these gun salutes are incredibly loud.