My Lords, it is indeed Invasive Species Week, and I would very much have enjoyed it if your Lordships had been with me in a ditch in Kent digging up American skunk cabbage. This is being undertaken by volunteers working in local action groups. Anyone who googles “Invasive Species Week” will find all the places they can go to help and work with the teams. Grey squirrels are one of the reasons people are not planting trees. If we do not find ways of controlling the grey squirrel, we will not have the treescape for future generations. That is why we think the investment in fertility research—I know the noble Earl has been working hard on this—that will make the grey squirrel infertile has a lot of prospects and will be a way of helping to control this very invasive species.