If the SCT system isn't good enough for people at the British Medical Journal then it isn't good enough for me.
If you want to opt out you can download the form, print out the third page and send it in to your GP surgery.
Curious to note the NHS is running a presumed opt-in policy with the SCR.
There's been advice against running under such a presumption - e.g. for mailing lists - leaving clients, customers or site visitors with the choice to opt-in rather than assuming they'll opt-in and making it difficult to opt-out. I think that is an aspect of systems engineering and design - usable, friendly and inviting to humans rather than being monolithic and stone-deaf to all complaints and queries.
You might want to check if you are in the pilot project for the SCR and, if you don't need your medical details to be online then opt-out. There are security concerns within the NHS.
