If you want to use a Superstore self checkout this is the first screen:
Are you PC Plus member?
If you press 'Yes' then you have to select one of the three options:
This is an extra click and screen.
I would get rid of the first question/screen and only have:
'If you are a PC Plus member please select an option by pressing one of the following buttons. If not press the 'No' button.'
Even better, the customer should not need to select an option but just scan their cards and the machine should recognize whether it is a reward card, credit card or mobile app.