I fully accept that argument, and I recognise that there are international constraints. For example, if there are areas to be avoided, that does not interfere with free passage. I have not been among those who have called for the total closure of the Fair Isle straits, in my constituency. If one cannot navigate a vessel through the Fair Isle straits, I am not sure where one can.
There are areas which should be avoided, but that will not stop the free passage of shipping. I would like to see it put on a mandatory rather than a voluntary basis. If that cannot be done internationally, why not do it unilaterally? As to the straits of Dover, there is perhaps more scope for action if we act as a European union rather than as a nation. I pay tribute to the European Union for bringing forward a series of proposals that are designed to improve shipping safety.
I now turn to some of the specifics.