Had a fantastic week last week working at Kineo on behalf of TDM. Really great working environment - relaxed but fast paced and very friendly people. Things would just turn up like boxes of fruit and packets of doughnuts that we could all tuck into as well as constant supply of proper coffee.
Mainly bug fixing on a Totara project using PHP but also picked up a bit about Postgresql (database), Trac (ticketing system), Passpack (shared passwords) and single sign on.
Aside from that... Brighton is a fab place!! Highly recommend it