The second phase of the world’s biggest offshore windfarm is set to be built off the Yorkshire coast after being approved by ministers. The multibillion-pound Hornsea Project Two would see 300 turbines – each taller than the Gherkin – span an area five times the size of Hull. Fifty-five miles off the coast of Grimsby, the project by Denmark’s Dong Energy is expected to deliver 1,800MW of low-CO2 electricity to 1.8m UK homes. The development…