Pooleys is not the only guide to be incorrect on the subject of Duxford. the pocket flight guide has it wrong too.
On the occasions that I have flown over for various airshows, it always seems to me to be very well run. The only run-in I have ever had was a little while back with a lady FISO and I don't know whether she is still around.
They do need to sort out their parallel runway usage though. Sounds to me like somebody has mis-applied CAP168. Would be interested in any informed comment, perhaps in a PM...