I have attempted to check books in and out when there has been no one else at the desk and been told that the staff have been told that they can not help. You said the system was to ease queuse if no one else is about what is the problem?
If you have items for issue or return staff can show you how to do this by demonstrating the self service equipment. The University has invested a great deal of time and money in up skilling staff to help with any query raised at the Customer Service desk. Issuing books is one level of enquiry. The response is to show the customer how to use the self service equipment. This is expected practice in the majority of HE and Public libraries in the UK. Our staff are trained to help with every stage of your academic journey and ensuring that you can issue, return, renew and reserve any items required for your research - not matter how tiny - is the first step.