The Iron Age started in Turkey, but in those days it often took centuries for ideas to spread. The Iron Age reached Britain about 800BC.
To make iron you need a much hotter fire than to make bronze. To get a very hot fire you need put the fire inside a brick box with a chimney. It is called a furnace.
During the Iron Age, metalworkers became even more skilled, and could make not just spears and plough tips, but also wheel rims, nails and much more.
