I must respectfully disagree.
In the first photo, the Queen can be seen to cast a delicate glance in the direction of Philip while the others are just starting to notice that all is not right with the world. Philip has one of those grins on his face that talks of proud ownership of his um, royal airs.
In the second photo, the Queen purses her lips in a display of mild irritation at her husband's transgression. Philip now has a wistful look on his face as he realizes that the rest of the party is now aware of the odiferous nature of his flatulence.
In the third photo, the Queen can be seen to move away from the source of the malodorious proliference. Philip, the perpetrator of the gaseous blast is now beaming with pride whilst the remainder of the party collapses in mirth at the spectacle.
Philip dealt it!
Or it was Professor Plum in the library with a candlestick!