That Davina didn't tell us which of the nominated housemates had the highest percentage of the votes when the programme started. I still wonder why she did this when Alison was evicted

I reckon it was a mistake when she mentioned it before - unless they are really trying to rig it!

probably because there was no advantage to C4 if she told us...
They knew both Spencer & Alex had alot of support that would make multiple phone votes at the last minute 'just in case'

As the vote was 55/45 and two million votes had been cast. Alex was nearly 200,000 votes ahead (approx). Unless a miracle happened any votes cast after she announced it were pointless. If anyone voted then they were wasting there money.

When Alison was evicted the poll was much closer. To announce the results so far would have resulted in a flurry of voting. Thus making CH4 lots more money.

Although I do agree that to do what she did then was wrong. Particularily as it was suspected that betting syndicates wanted Alison out.