CEP Senior Advisor Ian Acheson writes: David Lammy didn’t cover himself in glory this week in Parliament. Our Lord Chancellor chortled and guffawed while his shadow Robert Jenrick tried to hold him to account for the release in error of a registered child sex offender from HMP Chelmsford whose crime sparked national protests. The shelf life of ‘but the Tories’ as a reflexive response to every ill is running out. It has kept Labour MPs well fed and with some justification, but voters are less easy to satisfy. The latest security calamity comes, after all, a year and change after the arrival of the supposed changemakers.