There were two versions of the promo poster showing Marianne unzipped down to her navel.
One showed a belly button, the other didn't.
The idea being that the one displaying her belly button would be reserved for out of the reach places, as it was felt that this version would attract graffiti. The other version was for sites closer to hand.
Info from National Media Museum which has both posters on display.
They also have 'Stones in the Park' in their TV Heaven. Watch it for free in your own personal TV lounge. Also 'Johnny Cash at San Quinton (can't spell but you get it). A number of other Stones TV appearances on shows like Top of the Pops/All You Need Is Love etc
Worth a day out, and SAL is showing beginning of May.