A new European league of IQ scores has ranked the British in eighth place, well above the French, who were 19th. Britons have an average IQ of 100. The French scored 94. But it is not all good news. Top of the table were the Germans, with an IQ of 107. ... populations in the colder, more challenging environments of Northern Europe had developed larger brains than those in warmer climates further south. The average brain size in Northern and Central Europe is 1,320cc and in southeast Europe it is 1,312cc.