An important part of this trial is to find out about what it is like to take part in SAFER: participants’ experience of taking part (or not) and their views about screening for AF. We are particularly interested in understanding more about being invited to attend screening; the screening process itself; and treatment decisions for participants with a positive screening result.

We will be doing this by using a number of different approaches. You may therefore also be invited to take part in some additional aspects of the trial:

• Interviews with a researcher (by phone)
• Completion of brief questionnaires (by post or online)
• If you have a GP consultation to discuss your screening result you may be asked if a researcher can be present to observe the appointment (in person or by phone)

Not everyone will be asked to do these parts of the trial. If you are approached about any of these aspects, you will be given further details about exactly what is involved. You will be free to decide at that point whether or not you want to do them. You do not have to do them if you don’t want to, and if you choose not to you will still be part of the main trial. If you have any questions please get in touch with the trial team.

We are also looking at attitudes towards screening for atrial fibrillation in media and online sources. To do this, we will be looking at information which is publically available on key websites (such as heart disease charities and news websites), in major UK newspapers and on Twitter. We may quote tweets directly after anonymising them.