Firstly, here's the link to the UKVI webpage for visit visas:-

https://www.gov.uk/standard-visitor-visa/overview

Each will need to submit their visa application.

The key points:-
The earliest submission of application is 3 months before travel.
Decisions usually made within 3 weeks
Maximum stay in the UK is 6 months.
Cost of each visa is currently £87

Steve the major requirement is to clearly demonstrate a non-immigrant intent.
Means providing evidence of reasons to return home that outweigh reasons to remain.

The application needs to be made via the UKVI online application system.

Just for your info though here is a link to a downloadable form:-
https://www.gov.uk/government/upload...D__STUDENT.pdf

Here's a link for the guidance notes:-
https://www.gov.uk/government/upload...ANCE-NOTES.pdf

There are lots of posting giving detail hints and tips on how to go about the evidences for strong ties to Philippines/ returning home.

Once I get back home I'll take some time to find the most relevant posts on this.