God Maxima is beyoooootful.
When Harry was briefly dating that Posh Dancer there were pics of them leaving some burger place.
I think they just use a lot of back entrances and stuff.
And allegedly there's a lot of use of white Transit vans, on the fairly valid theory that nobody looks twice at a white Transit van. I heard W+K used one in Anglesea to go out and about.
Paul Burrell used to have to smuggle Diana's lovers into KP under blankets in the boot, but it was as much to evade the nosy security on the gate than anyone.
I also heard that despite his caution, Princess Margaret always used to know when someone was leaving Diana's apartment in the middle of the night as she would hear the rattle of the horse grid as Burrells car drove over it.