The WordPress community in the UK is on Slack at wp-community-uk.slack.com.
WP Community UK, is the team name for the UK WordPress community on Slack. It is primarily used to help support and sustain the many WordPress community organisers up and down the country. This tends to be in the form of discussions around venues, speakers, sponsorship and general discussions about running a group.
To join the Slack community visit https://en-gb.wordpress.org/slack