Several years ago, if I recall a large proportion of an African airlines (Kenyan?) 737 fleet was delivered via Manchester. As noted above MAN is a 24 hour highest category facility with unrestricted runways roughly half way on the great circle routing and with Boeing approved engineers always on site.
Many years ago, Boeing had their own operational engineering staff and liveried vehicles on site, this was at the start of TATL ETOPS and the introduction into service of the larger twin jets. They also had an office in the Cheadle Heath area, not sure if it's still there though.