Britain’s police inquiry into former prince Andrew is expected to be lengthy and complicated, senior officers have said, following his arrest earlier this year on suspicion of misconduct in public office — an offence that can encompass sexual impropriety. Andrew Mountbatten-Windsor was questioned under caution for several hours by detectives after his arrest at his Norfolk home in February, which came after the US Department of Justice released millions of documents connected to the late paedophile financier Jeffrey Epstein.…