We had a ton of stuff to shred the other day - several panniers' worth - and took advantage of a cycle-through security shredders in Greenwich. For peace of mind we could drop the blade-fodder ourselves directly onto the conveyor.
It comes out the other side mashed up into postage-stamp sized pieces. They in turn are trussed up into bales together with similar scraps of confidential confetti in a variety of languages.
Most seemed to be tantalising fragments of text in Cyrillic and Arabic. All very exciting; it could be the setting for a Bond movie fight scene.
Appropriately the entrance gates, in the industrial estate by the Blackwall Tunnel, had shredded fragments of text too.