- this is one of six models announced by Model 1 on 10th June 2021. This, and sister vehicle 5849 on route 722 (63319/20103), were eventually released on 16th November 2023.
World First Bus took delivery of one-hundred and twenty-eight 12-metre
New Generation Enviro500s between January 2014 and December 2015. The
first batch of thirty, 5720-5749, were registered between January and
April 2014. A batch of eighty-seven, 5583-5669, were registered during
2015. along with 5840-5851, which have a revised seating layout to
accomodate two wheelchairs. 5621 was first registered on 31st July 2015.