Looks like the success of the Belgium group have inspired our British friends to arrange a meetup too. They're cleverly using Google maps to see the best possible locations, so go add yourself to their map if you're interested (guide here).
Rumors are spreading that umbraco MVP Douglas Robar might join the event and they're trying to arrange an official level 1 course in the UK.
They're looking for a London venue that could potentially hold up to 20-25 people, so if you got an office and are interested in a lot of skilled umbraco people dropping by (maybe for a weekend), leave a note in the forum thread.
Fantastic to see all this self-organizing happening - good job guys!