I am not entirely sure whether the UK is included. Someone on the forums claims UK is included, but the koodomobile website suggests that it isn't.
If UK is included, get UK forwarding numbers. There are countless websites that will give you free UK forwarding numbers to forward calls to your contacts in the Philippines. Then you call the UK numbers you assign to call your contacts in the Philippines, which would count as UK airtime, not Philippines airtime. Otherwise I think Koodo offers 1000 UK minutes for $20. This trick will allow you to call most of the Americas, Europe, Asia, Oceania and a bit of Africa (no dice for Cuba or other expensive calling destinations), regardless of landline or mobile.
A bit of a daisy chain, but once you set it up, you're just calling UK numbers saved under your contacts.