The sizeable production run envisioned required the involvement of several external parties in addition to Handley Page. The resulting "Halifax Group" was established to oversee the manufacturing programme, comprising English Electric (who had previously been a valued contributor in the production of the Handley Page Hampden), various firms within the London Aircraft Production Group, Fairey Aviation, and Rootes Motors. Because of this scheme and other initiatives, the Halifax was manufactured by a variety of aviation companies at sites across the British isles.