>I take the point about the cam, but what's wrong with a wee shriney thing for thems as wants to leave bits of plants, light >candles or whatever flicks their switch?

It is a noble idea, but the fact that the shrine isn't a few thousand years old would render it useless I think. And I honestly think people that go there do respect the monument, and would play ball if they were asked to put the tealights on the floor rather than on the stones.