I pretty much agree with most of the posts, I'm just back from 6 years in Bohol and towards the end when there were 3 of us and a dog we were going through P50-60k a month (P9k rent, P3.5k elecy, P2k mobile/internet, P1k satellite, P2k petrol) Weekly groceries were about £5k in Tagb I suppose plus eating out/entertainment. It is possible to do it cheaper as mentioned but I tried and failed. Imported food is a killer (meat/cheese etc)
What you do have to allow for is the big ticket items, fridge/freezer, TV, laptops, multicab/SUV and also flights back to the UK for whatever reason. Electrical goods dont like the heat and humidity. I'm probably in the same boat, looking to work and save for the next 20 years and retire out there without the hassle of working which was a pain. Just lying in the sun sipping icecold SMBs. I would have to have an absolute bullet proof Health Insurance plan in place as a number 1 priority.
Good luck