The last instrument manufactured completely at the Edgeware Rd. facility in England was 890008 in 2002. The horn above would be one of the ones whose parts were largely built in Markneukirchen at the Schreiber-Keilwerth factory but was assembled and finished in England. I would agree with Dave that it is likely a 2003. Keep in mind this arrangement did not last very long as the old Besson went into receivership in 2005. The Schreiber-built instruments became York Brass and re-emerged in 2006-7 at about the same time as Buffet started their own manufacturing at the B&S plant also in Markneukirchen.
Adams E3 0.60 Sterling bell - Prototype top sprung valves
Concord Band
Winchendon Winds
Townsend Military Band