As said, you wouldn't have any problem with Bluray bought at Astrovision. Or even bought in the PinoyDVD Marketplace, they usually indicate if it's any region other than A.
You would encounter problem only if you bought Bluray from non-Region A countries or websites, most of the time this is Amazon UK (their England website). Most of the time, Amazon UK will indicate if the disc is Region-Free, if no indication, try reading the posted questions, if again, not one knows, then refrain from ordering. Most of time Blurays from Warner UK and Universal UK are Region-Free. Again, these refers to UK discs and Amazon UK.