Just checked and it's haelan tape (generic name is Fludroxycortide). Here's a link explaining what it does
http://www.typharm.com/typharm/docs/Haelan_Tape_SPC.pdf
Silicone Gel Sheets - scroll down to the bottom and listed under the heading Silicone Gel Sheet are all the products available on the NHS for scar treatment.
Silicone Topical Cream & Gel -the first section under the heading Silicone Topical Cream & Gel is a list of all the creams and gels available on the NHS for scar treatment.
http://www.ppa.org.uk/edt/July_2012/mindex.htm - Haelan is listed generically under Fludroxycortide 4micrograms/square cm tape 7.5cm. AFAIK it is not licenced for the treatment of keloid scars, so your gp may not want to prescribe it (although they are perfectly within their right to prescribe it if they feel it will work). Also haelan tape is cheaper than the gel patches and creams/gels in regards to cost per length of time needed for results.
You can buy certain gels/creams and patches from any pharmacy (if they don't have them in their first aid section they can order them in for you from their medication suppliers) but they can be pretty expensive (see the basic cost on the pages I linked to....and that is just the basic cost the nhs deem fit to pay the pharmacy, that doesn't mean that the product costs that much to buy before tax and it certainly isn't the price a customer purchasing the product without a prescription would pay).
xx
Edit: Grrr stupid drug tariff website won't let me link to individual pages
so for the gels, creams and patches click the contents tab and click
Part IXA - Appliances, click
DRESSINGS, then click on either
Silicone Gel Sheet or
Silicone Topical Cream & Gel .
For the haelan tape click on the contents tab and click
Part VIIIA - Basic Prices of Drugs Product List, then click
Part VIIIA products F haelan is listed generically under Fludroxycortide 4micrograms/square cm tape 7.5cm.
Alternatively just click the search tab and search for dermatix which will bring up the side bar for the gels/creams and silicone sheets, and fludroxycortide which will bring up the side bar for all drugs allowed on the nhs begining with F