Ok, the long story
We were all booked on the regular 20.20 service. Then the 20.50+bus appeared in the online journey planner, albeit briefly, which caused the original panic. A twitter query to IE confirmed (wrongly) that indeed the 20.20 had been replaced with a 20.50+bus. Then, later again, the [b:bbw5fzvx]20.40[/b:bbw5fzvx]+bus appeared on this[/url:bbw5fzvx] page. It's still there, wrongly.
Then the 20.50 reappeared in the journey planner, sans bus, and also in the printed timetable[/url:bbw5fzvx].
Earlier this week I had an exchange on twitter with IE as to which was running, the 20.40 mentioned here[/url:bbw5fzvx] or the 20.50 mentioned here[/url:bbw5fzvx]. I guess a lot of people saw the exchange.