you're a British citizen right? You can get a divorce there... once done, your wife will have to report the divorce and seek a court decree so that she can legally marry here as well...
The Supreme Court of the Philippines had noted three basic legal premises related to this matter:
1. “A divorce obtained abroad by an alien married to a Philippine national may be recognized in the Philippines, provided the decree of divorce is valid according to the national law of the foreigner.”
2. “The reckoning point is not the citizenship of the divorcing parties at birth or at the time of marriage, but their citizenship at the time a valid divorce is obtained abroad.” In other words, a divorce decree is valid even if the party who secured it was originally a Filipino or later reacquired Filipino citizenship, as long as he/she is a non-Filipino at the time that the divorce was secured abroad.
3. “An absolute divorce secured by a Filipino married to another Filipino is contrary to our concept of public policy and morality and shall not be recognized in this jurisdiction.”
The existence of a valid divorce decree, however, does not automatically entitle the Filipino to remarry in the Philippines. As noted above, the foreign divorce decree must be judicially recognized in the Philippines. This means that the proper action or petition must be filed in a Philippine court.
The divorce decree must be proven, just like any fact, in court. The presentation of only the divorce decree is insufficient. Proof of its authenticity and due execution must be presented. This necessarily entails proving the applicable laws of the jurisdiction where the foreigner-spouse (who could be a former Filipino) is a national.
source: http://jlp-law.com/blog/judicial-rec...ivorce-decree/