Indeed, Clarke’s junior minister Crispin Blunt has already been slapped down by Number 10 for suggesting that entertainments for prisoners should be reinstated.

Our starting point is clear of course: Labour’s record on crime is a good one. Contrary to government spin, the British Crime Survey – generally considered to be a reasonably reliable way to measure crime, as it reflects individuals’ reported experience, not just what the police record – shows a fall in crime under Labour, including violent crime. Fear of crime also fell. It’s highly regrettable therefore that Theresa May has decided to remove the public confidence indicator that focused police attention on actions that reassure the public.

What’s more, Labour’s track record wasn’t an accident: increased police numbers and visible policing (especially the highly successful and popular police community support officers) played their part. Tough and focussed action on antisocial behaviour helped too – though it’s fair to say that anxiety about such behaviour remains high on my constituents’ worry-list. A strong and growing economy over most of the past 10-15 years will also have contributed to the good results. Criminologists have long noted that crime is generally higher when the economy experiences a downturn, and it’s perhaps self-evident that people are less likely to turn to crime when employment’s plentiful and they feel better off.

What’s less clear is how effective penal policy has been in recent years, and here Clarke and Blunt are surely right to open up the debate. Under Labour, the prison population almost doubled, so at first sight that too will have contributed substantially to the reduction in crime. But no-one can feel proud of a prison population that’s now proportionately the highest in western Europe, nor at the high levels of recidivism among those sentenced to custody, and nor can we be comfortable with the cost. It’s surely right to look for alternatives to custody that prevent and reduce reoffending, punish appropriately, and protect and reassure the public.

That means far more attention to and support for strong community penalties, which are much less costly than custody, and which, by keeping those convicted close to their support networks, able to keep their homes and jobs, can contribute to improved reoffending rates. We must of course ensure that such penalties are genuinely demanding and constitute a proper payback, but importantly too we have to convince the public that these penalties are no soft option, and that they’re effective in reducing crime. In recent years, it’s not clear that we did very much to sell community penalties either to the public or to sentencers, as we sought to be tough on crime.

Of course we should be protective of the interests of victims, and here too Labour’s done good work. Information’s better, victim impact statements give victims their say in court, and the victims’ surcharge raised £8 million last year. But the coalition government is right to go further, by taking a serious interest in restorative justice – it isn’t by any means what every victim of a crime will want, but where it works it has proven empowering for victims, and appears to be contributing to better reoffending rates.

We must understand where and how far we got the balance of investment right, between prevention and punishment, between custody and community penalties, between focus on the victims of crime and investing upstream on preventative work with those more likely to offend. It’s good that new ministers are asking questions, and we must hope that will lead to a rigorous examination of what worked, and what proved good value for money, as part of the forthcoming spending review.

For our part, we must avoid finding ourselves locked into a kneejerk out-toughing of the government, and instead be open-minded in our assessment of the evidence of the past 15 years. After all, Labour has nothing to fear from such scrutiny. Our successful record on crime reduction is strong enough to bear it.