Most modern TVs will work on either video system, but I think the problem may be different. Looking at the antennas in the Philippines, they use VHF for the videon and a seperate lower VHF frequency for the audio, and the signals are often weak. Many TVs sold in the UK dont cover VHF, only UHF, so will not even be able to receive the signal.

But I saw 37" LCD TVs there for around P40k, so it would be more expensive to send it anyway.