"The Metropolitan police have received the first water cannon bought for use on the streets of the British mainland." See the article: Met police get first water cannon for use on British streets - Boris
“The Metropolitan police have received the first water cannon bought for use on the streets of the British mainland.”
See the article: Met police get first water cannon for use on British streets – Boris Johnson splashed out more than £200,000 on the secondhand crowd quelling machines (Guardian, link)