The Duchess has been off the line for a week or so because she decided that 6 cylinders are quite enough from cold. They do come back in when the engine is warmed up but it's a very nasty sounding idle/drive with 6!
Seeing as she has had new plugs and wires a couple of months back* and 4,7 are on the bottom half of the same coil - I'm wondering if this could be a coil pack issue. However, it seems a bit weird that only two of the four are missing. Or is that normal when a THOR coil pack starts to fail? Are they really two twin coils in a single box?
Or maybe it's something else entirely?
The codes are as you'd expect - catalyst damaging misfire 4, same for 7, then the multiple cylinder misfire error (logical) and sometimes adaptation out of range if I've been driving it on 6 for too long.
*which cleaned up a misfire on #2