There are a few simple guidelines which you should follow to keep your group's activities safe and legal. Similar guidelines apply to the activities of schools in general.
As a charity, Oxfam cannot express political views or promote any political party or campaign.
1. Your group should never promote or express support for a particular political party. However, you may comment on a party's position on a matter of legitimate concern to Oxfam (except in the weeks leading up to a national election when heavier legal restraints are in place).
2. Make the distinction between your opinion and Oxfam's. When using social media, be sure tag your school in order to make it clear that you are not an official Oxfam Spokesperson. If you describe Oxfam's stance on a particular issue, make sure you can say where you found it.
3. If an emergency or high-profile event takes place, Oxfam will provide background information within a few days. You can always ask for advice from your Oxfam contact.
When you put on events and raise awareness, it's likely that you'll ask people for personal data, for example to join a mailing list or sign a petition. In legal speak, any person holding information about other people is obliged to comply with the Data Protection Act 1998. This means that you should state very clearly how data will be used, who will hold it, and whether it will be shared with anyone else. You also need to make sure you store people's information really carefully.
It's illegal to fundraise 'for Oxfam' and then use that money for your group's activities.