In the Chartres cathedral section, it should be noted that Malcolm Miller, the British ex pat who offers tours of the cathedral, normally requires a minimum of twelve (12) persons to do his daily tours. This is clearly posted at the cathedral, and Malcolm says it hasn't changed in years. I told him Rick's guide says he requires only four (4) persons. He said that must be a misprint.
I visited Chartres last week, and found Malcom's tour to be very much worth it. He is an expert on the history of the cathedral, and interpreting the meaning of the wonderful stained glass windows.
Only seven English speakers showed up for the noon tour, but fortunately, Malcolm gave in and did the tour anyway.