Joe O'Toole (Independent)

I appreciate the Minister's intervention; this information is very helpful. I am worried about one thing, however. If I were a member of al-Qaeda and I wanted to do real damage to a city I would block up the two ends of its sewerage system and light a match. That is all it would take. There is a build-up of methane and other gases in sewerage systems around the UK and, I am sure, in Ireland. There are major movements taking place. There is also a danger——