"touch wood"
"don't walk under a ladder"
One common superstition in Iran is if you kill a frog, it will rain soon.
Probably that walking under ladders brings bad luck.
the modt common crop grown in Britain is wheat.
The most common form of murder in Britain is stabbing or knife-related violence.
Werewolves and vampires are most common in the Carpathian mountains. Witches are most common in the Alps.
According to The British Surnames Website, the third most common surname is "Harris". (see related link)
vauxhall andalucia
Labrador Retriever.
Smith
smith
Littering.
Britain's most common birthday is the 14th of November, as measured by birth certificates before December 1st 2009. The world's most common birthday is the 19th of March.