Why do you need a Guarantor Insure policy?
As a student guarantor, if you are entering into a tenancy agreement that makes you joint and severally liable then you are not just standing as a guarantor for your tenant and their share of the tenancy, you are legally standing guarantor for the entire tenancy and the conduct of all the tenants.
You probably don't know the other guarantors to the tenancy or their financial situation so in the event a dispute over rent or damages is taken to court you could be the guarantor that is deemed most able to pay and action could be taken solely against you.
In the event of a dispute over outstanding rent payments or damage the guarantor insure policy provides a dispute resolution service to help bring all the guarantors together to agree a fair and amicable solution should a breach of the tenancy agreement occur.
If a dispute escalates and goes to court your policy provides both legal and financial protection and limits your liability to your 'share’ (subject to terms and conditions)