Conversation so far:
When was the book, The Billionaire's Vinegar, published?
The Billionaire's Vinegar, written by Benjamin Wallace, was published in May 2008.
What was the name of the book about the Jefferson bottle controversy?
A book about the Jefferson bottle controversy was published under the title The Billionaire's Vinegar
What happened after the book, The Billionaire's Vinegar, was published?
In July 2009 it was announced that Michael Broadbent would sue Random House, the publishers of The Billionaire's Vinegar, for libel and defamation of character.
What did Michael Broadbent do next, after it was announced that he would sue Random House?
Michael Broadbent filed the suit against Random House in the United Kingdom.
Why did Michael Broadbent choose to sue Random House?
The book made allegations that suggested that Michael Broadbent had behaved in an unprofessional manner and that his relationship and dealings with Hardy Rodenstock were suspected of being improper
Where was Michael Broadbent's lawsuit against Random House filed?
Michael Broadbent's suit against Random House was filed in the United Kingdom
What location was Michael Broadbent's lawsuit against Random House filed?
The suit against Random House was filed in the United Kingdom

Question: Why did he not file it in the US?
Self-contained rewrite: Why did Michael Broadbent not file his lawsuit against Random House in the US?