Just to remind, to avoid any problem later when getting a visa (i'm not speaking of Philippines or UK, but worlswide) you MUST have an exit stamp if you have an entry stamp on a passport (both should be on the same passport). If not, the embassy where you will apply for a visa may think you overstay (or get illegal alien in this country) and so you may be in trouble to get this visa.
It's not specific to a particular citizenship, it's for all applying for a visa in any country.
