The U.K. is gaining in popularity as a great place to start a tech firm. The country is quickly catching up to China on the tech investment front, with VC investments reaching a record of $15 billion in 2020, according to TechNation. A global health crisis notwithstanding, London remained a favorite for investors. U.K. cities made up a fifth of the top 20 European cities, with names such as Oxford, Dublin, Edinburgh and Cambridge rising to the fore in 2020. Bristol proved especially popular among tech investors last year —…