My Lords, if we did not know it before, we now know that this will be an important issue, and it might go on for a little while. I do not intend to delay progress with a lengthy speech. I want to make what I think are the essential points about
7.5% replacing 5% tolerance levels in the Bill. Incidentally, we can almost safely ignore the amendment from the noble Lord, Lord Forsyth, which is coming later, to reduce the size of tolerance to 2.5% as simply ridiculous. It is never going to happen—but I know it will be debated.
So why 7.5%? It would set variance levels against the normal size of constituencies to allow the Boundary Commissions sufficient latitude to determine where boundaries lay. Incidentally, when the figure of 600 constituencies was proposed, 5% tolerance levels were still part of the proposed legislation that never saw the light of day. That would have given a variance higher than the 7.5% based on 650 constituencies, given that the size will significantly reduce. Therefore, the numbers do matter to the argument. This is important to constituents because it will make it less likely that they will move from one constituency to another, allowing MPs, as we heard on the previous day in Committee, to build bonds and relationships with their constituencies.
The reason why 7.5% seems sufficient comes from evidence taken in the Commons Select Committee from Dr Rossiter, who demonstrated that having tolerance levels of up to 8% has a significant impact on constituencies—and after that it is a diminishing return. I therefore argue that 7.5% is a better level at which to set tolerance than, say, 10%, which will be argued by my noble friend Lord Lipsey, because the amount of benefit between 7.5%, 8.5%, 9.5% and 10% is significantly less than on the way up to 7.5% from a 5% tolerance level.
There is a difficulty in the redistribution of, say, 16,000 electors to neighbouring constituencies in the event of one ceasing to exist, and the knock-on effect is felt most in neighbouring constituencies. However, it is not just in these that the impact happens; it happens as a ripple effect across county areas, beyond these into other counties and so on. That impacts on the relationship between constituencies and local authority boundaries and therefore makes it more likely that we will have ward splittings and all kinds of other means by which the Boundary Commissions can set constituencies at the 650 level with the 5% tolerance applying within them.
The ripple effect becomes more of a wave. Therefore, by giving tolerance levels the variation that we seek, you reduce the disruption to electors and the impact on the relationship between elected representatives and constituents, and you increase the political stability that is felt and needed in terms of the ongoing relationships that exist between constituents and their representatives.
In giving this presentation, I am also grateful to Greg Cook, who is a long-time researcher of these things. He has conclusively shown that these variations are not the thing upon which outcomes of elections are decided. This is not a partisan plea from the Labour Party to seek greater influence in the outcome of elections. What determines these outcomes are events that take place as a result of Governments’ and Oppositions’ competence in responding to the challenges that they face: the “events”, as Macmillan called them, not the size of the tolerance levels around constituencies.
If you broaden the tolerance levels, you give the Boundary Commissions a greater chance of getting constituencies that are right and felt to be so by communities and their elected representatives.
So I ask the Government, before concluding this position, to think carefully about what works best in the interests of the whole nation.