The official UKNova IRC channel is #uknova, on the ViSiON-iRC network. Use ‘irc.uknova.com’ as a server name; direct link for IRC client users.
Popular clients include mIRC and XChat (free Windows builds).
(Requires JavaScript. In-page chat provided by Mibbit. Access is routed through Mibbit's third-party IRC access server; regular ViSiON IRC users should choose whether or not to trust it before entering their NickServ passwords.)