Cocolepew - ask the GP to read their copy of the histology report in your hysterectomy. It should have been sent to histopathology for analysis. The macroscopic and microscopic sections of the report should state whether cervix was present. If they havent got a copy of the report then they can ring the histology department for a copy.
The top of the vagina where it meets the cervix (or where it used to be!) can be notoriously difficult to see cervical remnants post hysterectomy.
Did the GP have any idea what is causing the bleeding?