Cool,
'Put in a store and see how you do', basically it's like a second interview, maybe cos they had so many applicants, and they want to whittle it down further.
Just be yourself and try not to be nervous, /awkward.
Loads of people do this, (I call it free labour, lol kidding), cos they get so many applicants, they're just trying to make sure they get the best person for the job.
I did one of these for some other job and got really nervous, and acting proper awkward, so I didn't get the job.
Lol they were like after the interview , 'well done for getting this far, you are through to the second stage'
I was like 'second stage, what does that mean'.
'Well,ordinarily you'd have got the job, but because so many people applied, we have to do second interviews.'
Or maybe they really just want to see how you get on, I'm not sure.