MANY thanks Trinity 09L. The journey was unexpected and well outside the GLA, so we knew it was bad. Also, as I was recovering from a serious illness, and it was very cold we had no time (or mental energy) to fight.
So I'm gathering information to decide if what happened was legal. Thus far, it appears to be price fixing between BAA plc and those drivers that chose the nice long jobs. I'll let you know in due course.