Question: This single-decker bus body was built for the VDL SB200 lightweight single-decker bus chassis by a coachbuilder that was established in what year?

Context paragraphs:
VDL SB200: The VDL SB200 (previously known as the DAF SB200) is a light-weight 12m low floor single decker bus chassis produced from 2001 by VDL Bus International (formerly DAF Bus International).  It replaced the SB220, the longest of the DAF bus chassis in the UK before the renaming of DAF Bus International.

Wrightbus: Wrightbus is a Northern Irish coachbuilder and pioneer of the low-floor bus based in Northern Ireland; it was established in 1946 by Robert Wright and currently run by his son William Wright.

Plaxton Centro: The Plaxton Centro is a low floor single-decker bus body designed by Bluebird Vehicles and manufactured by Plaxton.  It was launched on the VDL SB120 in February 2006.  The Centro was also made available on the VDL SB200 chassis in 2006.  In 2007 the Centro was made available on the MAN 12.240 and the Volvo B7RLE chassis.  The first operator of the Volvo chassied example was Rotala subsidiary Wessex Bus for the Bristol Park & Ride service East Yorkshire Motor Services had 6 Centro bodied Volvo B7RLEs delivered in 2008.  In 2010, Blackpool Transport took delivery of Volvo examples.  Plaxton bodied the MAN 14.220 chassis in 2008 before this was replaced by the MAN 14.240 in 2009.  Users of the Centro include TM Travel, Arriva, Centrebus, GHA Coaches, Wessex Bus and Diamond Bus.  As of 2014, the Centro is no longer available from Plaxton as the parent company Alexander Dennis phased it out in favour of its own Enviro300.

Volvo B58: The Volvo B58 was a mid-engined single-decker bus, double-decker bus, single-decker articulated bus and single-decker coach chassis manufactured by Volvo in Sweden from 1966 until early 1982.  It was succeeded by the B10M.  The Volvo B58 is often rebodied as a double-decker bus chassis for the East Lancs Droop Nose double-decker bus body.

Volvo B7L: The Volvo B7L was a fully low floor single-decker bus, double-decker bus and articulated bus chassis with a rear engine mounted vertically on the left of the rear overhang, it was built as a replacement for the Volvo B10L.  It was used as both a single-decker bus and a double-decker bus chassis largely in Continental Europe.

DAF SB220: The DAF SB220 was a full-size single-decker bus chassis produced by DAF Bus International (now known as VDL Bus Chassis) in the 1980s and 1990s.

Wright Pulsar: The Wright Pulsar is a single-decker bus body that was built by Wrightbus in Ballymena of Northern Ireland for the VDL SB200 lightweight single-decker bus chassis between 2006 and 2014.

East Lancs Myllennium: The East Lancs Myllennium is a type of single-decker bus body built on MAN, Volvo, DAF/VDL and Alexander Dennis chassis.  It was built as a single-decker and double-decker body, with double decker bodies having slightly different names (see below).

Wright Commander: The Wright Commander is a low-floor single-decker bus body built by Wrightbus in Ballymena, Northern Ireland on the DAF/VDL SB200 chassis.

AEC Reliance: The AEC Reliance was a mid-underfloor mounted engined single-decker bus and coach chassis manufactured by AEC between 1953 and 1979.  The name had previously been used between 1928 and 1931 for another single-decker bus chassis.

Supporting paragraphs: Wright Pulsar Wrightbus
Answer: 1946