Participants were given a practise screen to explore before beginning the symbol-digit test proper. The real screen looked identical other than the wording mentioning practise.

This resource can be downloaded or viewed using the link: symdig_demo.png

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ctsu.ox.ac.uk/ukb/ukb/images/symdig_demo.png