You are entitled to ask for a referral for specialist treatment on the NHS. However, whether you will get the referral depends on what your GP feels is clinically necessary in your case.
If you wish to be referred to a specialist in a particular field, such as a surgeon, or a gynaecologist (a specialist in the female reproductive system), you should see the GP you are registered with. This is because all your medical records are held by that practice. Your GP also generally understands your health history and treatments better than anyone and will base any decision for a specialist referral on this knowledge.
For further Information please visit:NHS Choices
You can also phone the NHS e-Referral Service line on 0345 6088888 (open Monday to Friday, 8am to 8pm and on weekends and bank holidays 8am to 4pm) for further help.
Alternatively you may wish to contact the Hospital department directly that you have been referred to.