(Channel 4 comedy sketch series, 1999-2003)
“I seem to recall a sketch in which two women bus drivers, on passing buses, stop and have a heart-to-heart conversation, ignoring their passengers. I believe the vehicles were Carlyle bodied Darts.” (thanks Tony Martin) They were indeed: Metroline DT90 (H90LOX) and DT138 (H138MOB):

Note that DT90 carries Metroline Contract Services fleetnames.