Platform 9 3/4 is (canonically) at King's Cross. I believe the filming was done at St Pancras (not very far away, now extensively rebuilt to terminate the Channel Tunnel Rail Link). There is indeed a 9 3/4 sign on King's Cross, but (again from memory, it's been a while since I last paid attention heading for the Cambridge train) there is no pillar-on-platform between platforms 9 and 10, them being in different buildings (the sign is mounted on the wall as you pass from one building to the next).
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