My hon. Friend makes a good point, and I hope he will support me in calling on the Government to set a national minimum unit price to avoid that precise problem.
The argument has been made, in respect of Sunday trading and other issues, that if we let local areas decide, we might get a domino effect, but I would welcome it if areas without minimum unit pricing, for example, quickly realised that they needed to deal with the problem. These sorts of powers inevitably have a domino effect. It must be the intent of devolution to spread these powers around. The Government say they are keen to devolve such powers in a wide variety of areas. Given that there is real evidence—much more evidence, frankly, than on Sunday trading—of health benefits from minimum unit pricing, why not give local areas the power to decide for themselves?