Trevor Wilkinson, the founder of TVR, the small British carmaker known for nimble little sports cars that early owners often assembled from a kit, died Wednesday in Minorca, Spain. He was 85. His death was confirmed by Marshall Moore, president of the TVR Car Club of North America. The soft-spoken Mr. Wilkinson built his first car in 1947 as a race special and incorporated TVR Engineering (later simply TVR) the next year. The company name was a shortened version of his first name.