visitor visa

hi
i've been staying in london for almost 6 months on a visitor visa. i have to leave at the end of this month, cuz the immigration at heathrow stamped my passport the date i will have to leave uk. can someone tell me if i can leave UK and come back in as a visitor again?

Shouldn't be a problem as long as you weren't working illegally or anything silly like that. However whether you will be allowed back in immediately would be a question for debate.