LonDUG is participating in the Drupal Sprint Weekend (http://groups.drupal.org/node/277768)!
Everyone is welcome; if you have built a site in Drupal, you can contribute. We will split into pairs and work on Drupal core issues. Bring your laptop. If possible, install git (http://git-scm.com/) before coming and git clone Drupal 8 core (http://drupal.org/project/drupal/git-instructions). You can get a head start by making an account on Drupal.org and taking a look at the Drupal Ladder: http://drupalladder.org/.
Lunch will be provided by Digital Echidna.