I echo the hon. Gentleman’s comments about Jo Cox and, more generally, about security. It would not be appropriate for me to discuss it on the Floor of the House, but I assure him that I have already met the Chairman of Ways and Means and others to discuss matters of security across the parliamentary estate, which I take extremely seriously.
We have a clean air strategy, of course, and the Government have done a great deal to cut many emissions substantially over the past several years. Given that the Chair of the Backbench Business Committee, Ian Mearns, is still looking for opportunities for yet further debates, clean air might be a good subject. Mr Sheerman might like to approach him on that basis.