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Clara Amfo uses numbers to find out more about Biffy Clyro's career, calculating the maths behind the music to discover how their success adds up.

Like how many albums have the band sold? What number follows them wherever they go? And just how much money was a fan willing to pay for lead singer Simon's sweat towel?!

We speak to everyone from their producers, Chris Sheldon and Rich Costley, to the number experts who give us an insight to the stats that have made Biffy Clyro one of the most successful British rock acts this century.