As the hon. Lady will be aware, Citriodiol is a natural extract of lemon eucalyptus oil, and it is readily available to the public in a range of insect repellents. It has been issued to members of the armed forces to use at their discretion if they wish to. We are aware that it was efficacious against SARS. There is no evidence as yet as to whether it is useful against covid-19, but I can confirm, as per the hon. Lady’s question, that, at the request of the Surgeon General, DSTL is conducting tests on this product to see whether it is efficacious. If it is, we will of course let the House know and let that be known more widely as soon as possible.