Group A now meets Monday 14:00–16:00 in Lab 3 (previously Tuesday). Group B stays on Wednesday 09:00–11:00 in Lab 3. Group C now meets Thursday 14:00–16:00 in Lab 1 (previously Lab 3). Group A's move is permanent for the rest of the term. Group C's move is for these four weeks only, while Lab 3 is refitted. If your new time clashes with a lecture, email the lab coordinator rather than simply attending a different group. Places are limited by the number of benches, and an unannounced swap leaves one session over-subscribed and another half empty.