A detectorist has made the ''discovery of a lifetime" after unearthing a nugget of gold - shaped like Britain.br br Jonathan Needham, 54, found the gold on the Staffordshire and Derbyshire border - and believes it was formed naturally beneath the ground there.br br The nugget - shaped like England, Wales and Scotland - is almost 3cm in length and over 1cm wide and weighs 10.3 grams.br br Retired tree surgeon and treasure seeker Jonathan says his ''Holy Grail'' find on November 1 is his ''most interesting ever''.