my friend supplied me with a letter for a visitor visa previously. he used the sponsorship page of British Embassy Manila as a guide.
http://www.britishembassy.gov.uk/servle ... 9287486166
here are the relevant parts I can see -
What evidence can I supply?
There are no hard and fast rules about what documentation you should produce when sponsoring a visitor to the UK. You may wish to produce evidence of your own immigration status in the UK, and there are some other things you can do, particularly if the visit is for a special reason:
If the visit is for a holiday and you are a relative or a friend, a letter of sponsorship explaining your relationship to the applicant and why the visit is taking place at this particular time may be helpful.
If you are offering to provide support and accommodation or to pay for travel to the UK, you must provide evidence of your ability to do so. The following would be helpful:
a letter of sponsorship detailing your occupation and salary and how you will be supporting and accommodating the applicant. There is no need to have this letter attested before a solicitor or Commissioner for Oaths
evidence of your ability to finance the trip, such as copies of your last six months' bank or building society statements and salary slips. If you are in receipt of public funds the entry clearance officer will need to consider carefully how long you will be able to maintain additional people on limited means; you will not be able to seek additional public funds to support the applicant