Universal Studios will build its first European theme park in Bedfordshire, England, studio officials said Wednesday, previewing a sprawling resort that could combine iconic American brands like “Jurassic Park” with classic British characters like Paddington Bear, Dr. Who and Harry Potter. Set to open in 2031, British officials said the yet-to-be-named theme park would be Britain’s largest single tourist attraction. Executives at Comcast, Universal’s parent company, said the 476-acre complex would include themed lands, rides, a 500-room hotel, shops and dining. Keir Starmer, the British prime minister, hailed the announcement as a boost for his country’s sluggish economy and an example of his government’s attempt to cut through the red tape that has long made it costly and difficult to complete complex projects in Britain. “Today we closed the deal on a multibillion-pound investment that will see Bedford home to one of the biggest entertainment parks in Europe,” Mr. Starmer said in a statement, adding that the project would create around 28,000 jobs.