Poor old Sally Bercow, it only took her about 20 minutes to realise she may have used the wrong language when talking about some hecklers by calling them "smack heads".
One presumes she saw some track marks or burnt silver foil when she made the judgement that they were heroin addicts?
Sadly, deleting the tweet came too late as did deleting the apology!
UPDATE: Looks like I might have upset her. Funny thing is, I she might even have been right about the hecklers.