Text Santa, ITV's festive appeal to help six charities, culminates tonight with a special appeal show but throughout the day there have been fundraising events.
And stars of West End shows got in the spirit of things this afternoon, by singing Christmas carols in Leicester Square.
Here's our Arts and Entertainment Correspondent Lucrezia Millarini.
More top news
An English springer spaniel given to the UK Border Force has become a star new recruit for sniffing out smuggled cash.
Celine Dookhran, 20, was allegedly kidnapped by her relative Mujahid Arshid, 33, and his employee Vincent Tappu, 28, on July 19 last year.
Collins hid the device, two sim cards and two memory sticks inside a crutch while on remand in September.