Looks like that lego building on Lord Street, another like it in Hanover Street but its more of a market like they did with the co-op dairy on east prescot road
It's the arcade in a building in water street I believe, as kids in early 80s it was open but not to that splendor. As a side note, I recall hearing about a soft of reservoir, spring type thing under a building in the area but can't find anything online now? Thank you. Hope I'm correct about mall. Is it same one that had a post office in? Cheers