Drama film from late 90's/early 00's. Last scene of a man roasting on an open fire!

Hi. I hope someone can help.
I remember watching a film late at night on Channel 4 in the late 90's or early 00's. It might of been a straight-to-TV film, or maybe not classified as a film at all but as a one-off drama.
It was a drama with an element of dark comedy about it I think. I'm sure it featured all British actors (might be wrong though), and one of which was a white Scottish guy, of whom I did recognise from other programs/films at the time.
My memory is very hazy, to say the least, but I think it was about some adults (4 I think, but possibly more) who had became trapped/lost in a jungle or on an island somewhere.
I remember there was nudity and sex scenes and the exchanging of loyalties between the members of the group, but the one scene I can remember most vividly, was at the end of the film, of the aforementioned Scottish actor being found by someone (one of the females of the group) roasting on a spit over an open fire! He'd been killed and put on there by another male member of the group.
There can't be many movies with an ending like that, surely!
Thanks for any help.