Just poking my nose in a little late here.

Leaving the Philippines with debt will not cause any problems.

Arriving in the UK with debt may or may not depending.
Believe it or not there are debt collection agencies (of sorts) here.
If the creditor decides to sell the debt on to an agency within the EU there's a risk of 'skip chasing' success. Better to find ways to 'ringfence' your assets.

Good luck on that one.