Well I'll tell you briefly what's happening. The whole of the square mile of Trafalgar Square has been cordoned off.
10 seconds sound clip from The Goon Show, Series 4 Special, The Starlings classic radio program.
You can hear this line at 00:06:13 in the radio play.
Quote context
[...]
(Soldiers marching and commanders shouting out orders)
- What a magnificent sight! Aughhhh!
- Good morning, err, Major Bloodnok?
- I'm Mr. Cringing-Nut, of the Morning Flight.
- Oh yes, you're one of the observers aren't you?
- Yes. Only curfews our allowed in.
- What does the noise making equipment consist of?
- Sergeant Steinbacker! Sir! Explain the noise equipment to this gentleman, would you?
- Yes sir!
[...]