trying to get a diagnosis for son age 11

Hi I am new to the forum. Having searched the web for answers I hope you can help.

My son shows traits of aspergers. His primary school advised he wouldnt benefit from being "labelled" so we didn't take it further, that was age 7. As his traits have become more obvious we now want to get him support. Our GP agreed and refered him to our hospital. The hospital have written back stating they wont see him unless a list of things are provided

teacher report

SENCO report

My Plan evidence

Advisory teaching service report

Have I missed a step? How do I get these reports. He is about to start secondary school  his new teachers won't know him yet so wont be able to give much of a report.

Please can you advise what I should do now?

Thank you in advance