I founded this fantastic photos which shows the part of the Principal Corridor at the East wing at Buckingham palace. Direct from them the Royal family enters at the Centre room.
On the wall you can see the large portraits of the Queen Alexandra and king Edward VII.
This is the first time that i seen how this corridor look like
Enjoy

The part of the Corridor at at the East wing

The part of the Corridor at at the East wing

Chandeliers on the ceiling
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On the Architect plan you can see where is located this part of the Principal Corridor