Apparently uk IT security is crap...

I don't usually think much about this kind of stuff in films, but when I was in London I had to open my fairly small purse at almost every landmark I visited, and sometimes they stuck a wand inside for good measure. There's no way Riley could have gotten that huge backpack full of tech into Buckingham Palace, and the BS factor was high enough to be a distraction. Geez, bring a steamer trunk next time; I'm sure they won't mind.