There has been a place of worship on this site since pagan times. The present church being built in 1722.
It was named after St. Martin who is said to have taken pity on a near-naked beggar, cut his own cloak in two and given half to the beggar. Christ appeared to Martin in a dream that night as the beggar and thanked him for his kindness. Martin converted to Christianity the next day.
Today St. Martin's is known, amongst other things, for its Christmas Appeal, raising money (some £500,000) for the homeless.
The church stands on one of the corners of Trafalgar Square so, as parents were not allowed inside the church for the carol service, I took a walk around the Square:
The well-known 'empty plinth' at the moment has a giant ship-in-a-bottle standing on it:
I also popped into the National Portrait Gallery where I saw, in particular, fantastic portraits of Judi Dench and Fiona Shaw (best known for her portrayal of Aunt Petunia in the Harry Potter films).
An enjoyable day.