In this task, you will be presented with a question and you have to answer the question based on your knowledge. Your answers should be as short as possible.
Q: What year was the constructor established upon separation whose driver finished a close second to Ayrton Senna in 1983 British Formula Three Championship ?
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
1955