Conversation so far:
when did Zola Budd arrive to britain?
1984.
Are there any other interesting aspects about this article?
The Daily Mail, a British tabloid newspaper, persuaded Budd's father to encourage her to apply for British citizenship, on the grounds that her grandfather was British.
did she do so?
With a strong push from the Daily Mail, British citizenship was granted in short order and she moved to Guildford.
what did she do once she became a british citizen?
Shortly afterwards, Budd was forced to pull out of a 1500 metres race in Crawley, Sussex.

Question: why?
Self-contained rewrite: Why was Zola Budd forced to pull out of a 1500 metres race in Crawley, Sussex?