Not exactly a stray but driving along the road (old B4525 now unclassified) from Banbury, I followed a 59 registered Optare Solo of Heyfordian which was showing route number RL1 on the rear blind.
I followed it as far as the A45 Daventry roundabout at Kislingbury where it turned towards Northampton.
What is this service, where does it originate from and when and how frequently does it operate?