David,
Have they built an extra platform at Piccadilly since your first photo was taken? I could be mistaken but the nearest platform now looks narrower and there appears to be more of them. The design of the nearest platform also looks slightly different.
The platform canopies are noticeably different and the bullhead track in the foreground on your earlier shot has been replaced with flat bottom.
It also looks like the glass in the main station overall roof is of a slightly different style.
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