Here is a link to an example of the new prescription form, wich has a new box for UC and some other changes:

Note that instead of ticking a box you are supposed to put a line through it now.
(That will be so a computer can scan it).

Of the other changes the ones most likely to affect some people here are:

Box 'C' Over 60's exemption is now combined with box 'A' Under 16's. (Box 'C' has been removed).
Box 'G' "has a War pension exemption certificate" has been reworded to “Prescription Exemption Certificate issued by the Ministry of Defence”.