We can now make doctor's appointments online by clicking on this link.
The information required is your SIP card number and date of birth. I've just tried it out and it works. Well at least for Pamela who had an appointment last week it does.
Apparently we should be able to view, make and change appointments using this ABUCASIS system. Well that will be better than having to drive down to make an appointment and then driving back again to attend it.