Doctor Who - old and new, BT Tower/The Shard

Watching Matt Smith's Doctor Who ("The Bells of Saint John") last night featuring London's latest architectural marvel, The Shard, made me think back to William Hartnell's Doctor Who. Remember the mid 1960's episode featuring London's latest dramatic landmark, the Post Office Tower (BT Tower)?  I am sure Steven Moffat knew what he was doing. Nice touch.