The P4EU practical course on building multibac expression vectors took place on 28^th May to 1^st June hosted by the Research Complex at Harwell, UK. The eight participants on the course gained hands-on experience of the workflow for assembling multigene baculoviruses, including  cre-lox recombination of donor-acceptor vectors, use of EMBacY for generating recombinant bacmids and following expression in insect cells. The course was very interactive with lots of discussion within the group and with the practical course leaders (Fruzsina Rabi and Fred Garzoni) and course organisers (Ray Owens and  Imre Berger)