All Roads Lead Home in which three presenters used techniques of natural navigation to make their way around Cornwall.
The natural navigation bits were good.
There was a description of how to use trees as direction finders given their shape is often influenced by prevailing winds (SW in the UK), as in the pic above which was described as the Trump hairstyle.
Another influence on trees was the N/S variation in growth, the so-called tick effect as in the following graphic:
on your marks, get set, bake".
To be honest I'd recommend anyone interested in learning about natural navigation that the best way would be to buy and read the book.
If you want an update on unnatural natural navigation there's a list of top tips at the BBC. Number 1 tip, about satellite dishes, is a favourite of mine, though I say they are SSE rather than SE, but there you go.