I made this poster as part of the #StopDSEI campaign, which went up alongside a whole load of other posters in 30 bus stops around London, helped in no small part by the wonderful humans at Special Patrols Group.
I did an interview with Vice about the project, which you can read here.
If you're interested in subverting an advertising space near you, check out the Ad-Space Hack Pack Strike! Magazine put together.