This page explains the duties you have as a sponsor under the tier 5 - charity worker category of the points-based system.
When you assign a certificate of sponsorship, you guarantee that the migrant:
This is a virtual document (a unique reference number) that an organisation gives to migrants they want to employ, and that the migrant uses when applying.under the points-based system for coming to the United Kingdom to work, train or study. Also known as confirmation of acceptance for studies.