Dear Anne,
I said I would get back to you regarding the question of local knowledge being required in the hiding of a body.
I am sure Gerry McCann is a lot more clever and quick thinking than me, but the thought of doing something like that under pressure of time with no pre-planning just doesn't seem possible.
What location would he pick? Burial would need knowledge of the ground in a particular spot - and equipment. Burial at sea would need knowledge of tides. (Tides in PdL not conducive to carrying a body away anyway - would GM be likely to know this?!). Caves, tunnels, drains, lava tubes in the rocks - how would a first-time visitor to a place know about these things?
And how could he possibly know that the place he had selected, without any researching, would be somewhere no-one would search or find?
Apologies to Gerry McCann for even putting it like this, because I feel the whole idea is preposterous. And it seems to me that the proof of the pudding lies in the last point - the fact that despite the whole area being combed by locals, nothing whatsoever has ever been found - not just a body, but clothing or any other piece of incriminating evidence. IF she died and was disposed of (excuse the graphics) in PdL or environs, it was done exceptionally well by someone with local knowledge - or the perpetrator was astonishingly lucky.