It is virtually impossible to put everything on the front page of a website or indeed when on a notice board to put it so that it is instantly seen by every one in the village. Frankly, if it is on a facebook site, it is probably reaching more people than most notice boards or websites reach. Why do you say that the council's own policy of using the website is not being met when you've said the notice is on the website? From what you have said, the statutory requirements have been met and exceeded. Assuming you are aware of the notice (having commented on it here) you and anyone else who has seen it can encourage residents to request an election in accordance with the notice. If nobody does so, the council is free to co-opt. There is no loophole.