I will come on to explain that—but, of course, if the noble Baroness is not satisfied I will be very happy to write her another letter, splendid or otherwise.
Horizontal-launch sites will be aerodromes and therefore subject to provisions similar to those in the Civil Aviation Act 1982 that apply to aerodromes. We therefore expect that the main use of this power, if it is needed at all, will be for vertical-launch spaceports. On vertical launch we will continue to learn from countries that have extensive experience of launch. One such example is the United States, where the Federal Aviation Administration has implemented a launch-site boundary with a radius of 2.2 kilometres from the launch point for small vertical-launch vehicles that are likely to be similar to those that will be launched from the UK. This is an area to which access is restricted during a launch window. The proposed sites are much further away from local towns than the area that is likely to be restricted under a Clause 40 order.
I turn to some of the points made by my noble friend Lord Deben. Interestingly, the power is based on similar powers in the Civil Aviation Act 1982. I do not know whether my noble friend was a Minister in another place when this Act was passed or a Member of Parliament during the debates, but the powers do not go as far as those in the Civil Aviation Act.
My noble friend Lord Deben also asked why we are doing it, if there will not be many launches. We believe that these powers are necessary in case a licence holder cannot, despite their best efforts, secure a deal for access to land or restriction of the use of land during launch and landing. Invoking the Secretary of State’s power would very much be a last resort.