Response from Weldricks for online NHS orders:
"If you have a NHS prescription for Actipatch, please place your order via the website, please opt for NHS prescription (no description of goods necessary), if you pay for your prescriptions you will be prompted to make the £8.80 charge, if exempt please tick to back of the prescription.
If you have a private prescription, please let me know as I can add the products to our prescription section for you."
... And I'd wager it's just as easy to do from the Boots website.