It was recently announced that the UK Government would try to boost the use of imperial measurements in the UK, ahead of the Queen's Platinum Jubilee.
Britain currently uses a mix of both imperial and metric measurements - with speed limits in miles per hour rather than kilometres, and milk and beer bought in pints. Only three other countries - the US, Myanmar and Liberia - use the imperial system on a daily basis. Traders have been legally required to use metric units for the sale by weight or measure of fresh produce since 2000, when the EU weights and measures directive came into force. It is still legal to price goods in pounds and ounces but these have to be displayed alongside the price in grams and kilograms.
But UK Government officials claim that reverting back to the imperial system would, apparently, bring "a bit of our national culture and heritage back onto the shop shelf". Mr Johnson is expected to make an announcement this Friday to coincide with the royal event.
