I think you will need to do a lot of research into the teaching requirements here in the UK. If you are a teacher in Phils already I do not think that your qualifications will allow you to teach here without gaining further UK recognised certs. You will also have to be checked by the police ie: CRB check, before they let you loose in a classroom of kids.
This is not really the best place to look for an exchange, take a look and register here: http://www.tes.co.uk/ there will be lots of info from teachers here. I used to teach so I know this is the best place.
What subject and ages in Guam are you exchanging ?
