London CM2 - London Night Bus - https://medium.com/citymapper/cm2-night-rider-our-first-commercial-bus-route-d9d7918be899 - Uses E200s.
London BB1 - Bus route, but it uses taxis - https://medium.com/citymapper/project-black-bus-4a838ddf7c06
Hertfordshire CM81 - Bus route, operating daily from 07:00 till 23:00 -
https://www.intalink.org.uk/uploads/publications/1502.pdf