Paul,
I am sure what is obvious to most here on the forum, may not be so obvious to you, a fiancee visa is in fact the wrong term, commonly called a fiancee visa, its actually a marriage visa and nothing else but a marriage visa.
Marriage visa's are issued to fiancee's/fiance's of British nationals, who are presently settled and living in the UK.
You cannot bring your fiancee to UK on a marriage visa, unless you intend to marry within 6 months of arrival in the UK.
Should you wish to marry in the Philippines, and then bring your wife back to the UK, you would require a settlement visa for your wife.
Should you wish your fiancee to come to the UK and meet your ageing parents, your fiancee would need to apply for a tourist visa, however, this route, whilst not always a risk, is a 90 per cent risky operation, and could result in a refusal to issue a visa, however, truth is the best policy, if you can ensure that you make it very clear on the tourist visa application, that the applicant does know you in the UK, and they are in a relationship with you, at least you have furnished the Embassy with the full facts.
Failure to disclose all pertinent facts, and to not give truthful answers to all questions, could lead to a refusal to issue, and a 10 year ban on your fiancee applying to enter the United Kingdom.
Certainly if you wish to marry in the Philippines, your fiancee may not apply for a fiancee visa, if she did so, the application would be unsuccessful, I hope that makes the position clear, please beware of professional visa applicants, they often give poor advice, and the outcome is a heartache, when the answers they give are the ones you want to hear.
This forum has a tradition of very good advice, and its generally 100 per cent on the ball, best wishes, and I hope you get the visa you need.