On Saturday night just gone I had three recordings set. 9pm Casualty, 9pm Hostages and 9.30pm The Jonathan Ross Show. In the past I've seen the failed recording but on this occasion the Humax recorded the last 30 minutes of Ross.
On another note is that I still don't see the Humax offer up CH4+1 as an alternative to 4HD when setting up my recording schedule.
P.S. I had two issues following the last firmware update. A couple of re-boots and a black screen when ending playback of recordings. I couldn't duplicate these so did a factory reset (not format) and this appears to have sorted it.