Difficult ... but NOT impossible! If you're confident about meeting the criteria then, naturally, it'll be a lot less difficult. And, for a fee of 78 GBP (marginally under 4,500 Php) it's relatively inexpensive.

Further information may be obtained by first, googling the UK Border Agency's Home Page, then clicking on the appropriate Section(s) relating to tourists.

Meanwhile, to the online filipino/uk community.