Another hint....since the guard, once it gets inside, is nothing more than a couple of rows of soldiers being examined by their officers, go to the fence at the extreme left or right of the Palace. There are always a couple of soldiers that march right across the front of their comrades, the whole length of the Palace frontage, and they end up right there in front of you before they turn about and head back. When we were there, an entire family turned up to watch their young son/nephew/brother take his turn...it was quite hilarious to hear him cracking jokes under his breath! Makes for great photos of the guardsmen, too.