[Greg!]

I think a format that would be consistent and fair and also provide the constant drama that Channel 5 crave would be:

Each week one Housemate becomes head of house by winning a Task.

The HoH gets to live in a luxury suite and gives a killer nomination to one Housemate, this would be done face to face for maximum drams.

The rest of the housemates nominate as normal in the diary room later in the week, and the three or more with the most votes will also face eviciton.

The house would then have a veto task, the winner is allowed to save and replace one of the nominated housemates if they wish, again face to face for maximum drama.

On eviction night, the two housemates with the least public votes to save will face a house vote
(face to face) and whoever gets the most votes to evict gets the boot. If it's a tie the HoH has the deciding vote.