Could be they shortsold at 21 to ensure a premium of 6c above...

Could be they shortsold at 21 to ensure a premium of 6c above the conversion
Shorting on this stock is not easy but it can be done
Hopefully but less likely its a big vote of confidence by someone.
Lastly there were big orders going through on AIM last night.Maybe someone has been taking a position by buying options to stay under the radar and is now coming out of the closet because they have already reached a point where they have to disclose -dont think so though