Pc Nigel Cowley, Det Con John Donohue, Pc Roderick James-Bowen and Pc Mark Jones all deny assault occasioning actual bodily harm.

BBC: Police officers 'attacked' terror suspect Babar Ahmad

Steve Levitt, an economist at the University of Chicago, and John Donohue, a professor of law at Stanford University, claim that women whose children would have been most likely to commit crimes as young adults instead chose to have abortions after the practice was legalised across the US in 1973.

BBC: News | Health | More abortions 'mean less crime'