Hi Jon,
If you have no intention of marrying her at this point then a tourist (Visitor) visa is your only option really. These visas are not very easy to get, but the chances of having one granted is far greater if your gf has a full time job in the Philippines, money in the bank in the Philippines, property in the Philippines or dependants (children) in the Philippines. Without any of these things, they usually make the assumption that she will have no real incentive to return to the Philippines when her visa expires and that she will overstay.
Iain.
