Making the Illustrated Map of London History and Culture, my latest piece, has been, by far, the most challenging work I have completed to date. The map took me 11 months from start to finish. In that time we endured the freezing 'Beast from the East', celebrated a Royal wedding, had a glorious heatwave (known as summer in most countries) and football very nearly came home. I also got engaged and moved house. A lot can happen in one year.