Yes they can and should. They get paid for children attending, if the children aren't attending they have an obligation to off role them and refuse the money for them. Their attendance figures will be looked at by the LA, and the LA won't be happy if the college is claiming for kids not actually there. Obviously if there is a reason and they can show that they were supporting the kid and trying to help them, that's different, but if not kicking them off is what they should be doing.