Welcome to OpenStreetMap. Unfortunately, changing the address of a building on Whitechapel Road does not move it to India Dock Road. Also, deleting the building=yes tag implies that the building at 21 Whitechapel Road is no longer there.

The best way for you to add your business at the current address is to add a point at its physical location on the map. Please let me know if you need any help with this.

I have had to revert your edit in order to restore the building and address. Please could you confirm whether Fujifilm at 21 Whitechapel Road has now closed?