Hydrogen

The original recipe for HP Sauce was invented and developed in 1899 by Frederick Gibson Garton, a grocer from Nottingham.

Garton sold the recipe for the sum of £150 to settle a debt with Edwin Samson Moore, the founder of the Midlands Vinegar Company, who launched what is known and loved today as HP Sauce.

If you didn't know, HP stands for 'Houses of Parliament' as it was rumoured the sauce was used in the restaurant there, back at the turn of the 20th century.

Since then the sauce has become so popular that a whopping 28 million bottles are consumed in a year - if the bottles were stacked on top of each other, they would reach the same height as 6,189 Houses of Parliament.

A colourless, odourless gas, hydrogen has the lowest density of all gases.

Hydrogen is an essential element for life, it is present in water and in almost all the molecules in living things.

Hydrogen is easily the most abundant element in the universe. It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen.