Lord Brennan QC, as an appointed life peer, is active in politics as well as dedicating time to his incredibly varied legal practice. His most notable case during 2009 was the landmark civil Omagh bombing case. The outcome, in favour of his clients – relatives of those killed in the Omagh bombing – has become the first civil case of its kind in Europe in which the victims of terrorism were able to sue those responsible.

In 2010, he was awarded the Lifetime Achievement Award at the Chambers & Partners Bar Awards.