I used Keysafe Tenant Vetting Limited to provide my details as a guarantor. It was very quick and easy. I got stuck briefly at the Open Banking page, which I completed but the checklist still said I needed to complete the step. After clicking to complete the step again, I realised it was the same process I had just been through. I used the back button and the process was showing as complete. The letting agency never let me know the outcome, but did tell the prospective tenant. That has not affected this review, as it seems common practice.