One of the best places to go is the Union Jack Tavern in Festival mall Alabang. It is a pub that serves authentic British grub. They have a shop next to the bar that sells a wide range of British food. They even have curly wurly! It is not cheap.

The bar is owned by David from Sunderland who also owns the famous David's Salon franchise in the Philippines.

http://www.unionjacktavern.com.ph/

The problem it is at least and hour from where you live and that is on a good day.

Have you tried the international sections in SM and Robinsons? The closer you get to Makati, they seem to stock more foreign products.