text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_8 (year INTEGER, venue VARCHAR, event VARCHAR, result VARCHAR)
  ### Question:
  What is earliest year that had a 50km event with a 2nd place result played in London, United Kingdom?
  ### Answer:
  SELECT MIN(year) FROM table_name_8 WHERE event = "50km" AND result = "2nd" AND venue = "london, united kingdom"