Conversation so far:
How was Robin Cook involved in opposition?
Robin Cook was one of the key figures in the modernisation of the Labour Party under Kinnock. He was Shadow Health Secretary (1987–92) and Shadow Trade Secretary (1992–94)
Did Robin Cook do anything else while in opposition besides Shadow Health Secretary and Shadow Trade Secretary?
Cook took on foreign affairs in 1994, the post he would become most identified with (Shadow Foreign Secretary 1994–97, Foreign Secretary 1997–2001).
How long was he in opposition?
He was in opposition from 13 July 1987 to 2 May 1997
Are there any other interesting aspects about Cook being in opposition besides the roles Cook took while in opposition?
Cook became known as a brilliant parliamentary debater, and rose through the party ranks, becoming a frontbench spokesman in 1980, and was the Shadow Cabinet's spokesperson on European affairs.

Question: When did the opposition end?
Self-contained rewrite: When did the opposition end?