Hi Pompey
I'm making a assumption that you are studying at Degree level in University! If you are here to enrolled on a education course for 6 months or more then you get free NHS. Here's some more info
http://www.adviceguide.org.uk/england/h ... abroad.htm
If entitled to free NHS treatment, in Scotland and Wales prescriptions are free, so no charge for insulin etc..
In England there is a charge made for prescriptions just under £8 per item, unless you qualify for an exemption certificate, which as you T1 you qualify for one!
So when you register with a local GP practice you will be able to get the application form (they've got to be counter signed by your GP you've registered with) it does take several weeks for the certificate to be issued, and until you receive the exemption card you will have to pay for any prescription issued... But if you find that you need to pay for a prescription before your exemption card arrives, you can ask the chemist for a form that enables to claim a refund once your card is sorted!
So it be wise to bring with you enough supplies to cover you for 6 weeks while you sorting everything out!
Every higher Education establishment with have a Disability Liaison Officer, so you need to contact them now, as they will be able to give or find out all the information you need, such as what medical records/Confirmation etc you need from your medical team to confirm your diabetic status etc.. The DLO you will be in contact with during your studies, as you go through them, for things such as when you'll sitting exams, so proper adjusts/access to meters/hypo kits etc can be arranged when you sitting exams etc..
Hope this information is helpful, and good luck with your studies