Downing Street "urges responsible reporting of what is happening and references to a "lockdown" "is not language I would use."
About this.
This is an issue of language.
The government haven't said here that lockdown won't happen. Just that the media should be careful of the language they use and not to use the term lockdown.
As far as I read this it's about trying to tone down fear and stop panic but it doesn't mean wide ranging powers to restrict activities and movement in the capital are not on the cards.
Johnson has a track record of dodging language in this way and saying black is effectively white.
I certainly do not rule out lockdown by another name. Look at what the government are doing in terms of legislation, putting the army on standby and documented planning rather than what is said by unamed sources at a media briefing....