Hello Harry,
I'm a bit late 'to the party' but I do gave current experience if the costs involved in setting up a life here.

I've said it any times before and I'll say it again
IMHO you need P50k disposable income to get by.

I know very well all the stories about living like a king for less.........and yes it can be done. When I would live in the outback of Compostela Valley I could easily survive on P15k per month.
But that's not living that's surviving. Yes, surviving quite well but not as well or as secure as in UK

Think very very carefully about the life you want and the costs involved.
If your priority is health care just be sure you can access really good quality care and equipment within around 30 mins by some means or other.
Car ownership is expensive and will likely steal a significant portion of your income. Think seriously about transport costs and you choice of living location.
You may find it's better to live in a 'city type location' to have the lifestyle you need than in a more remote location,
where your own transport is key.

Do you rely on medications?
Special diet ?
Consider the costs of staying here under visa conditions also.

Costs of living here are not the same as costs of vacations as tourist.