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"So we went and there it was, running up and down. The shop was shut and it was there all night," Peaple told This Is Local London.
He said in a Facebook post that Primark staff had apparently been aware of the rat when they closed the store.
"That's just wrong. You have to get it out, especially over the Christmas period. That's just nasty," he said. "I definitely won't be going back there again."
Peaple's video quickly went viral on Facebook and Twitter.
"It's not the sort of thing you expect to see in a shop," he told the Evening Standard.