sorry to hear your tale of frustaration, most ex pats I know who have businesses in the Phils have similar tales, my own tip for what it is worth is keep it small ,stay under the radar of potential jealous connected locals who will compete with you if you make to much money and rely on a Uk income source such as propery rental for your main money. That being said our rice farms and now the small piggery are making decent returns and keep some relatives gainfully employed, just my wife keeps them on tight rein in case of any skimming... and they are family.
a wise old hand in Palawan told me if you want to make a small fortune here bring a big one