On Friday night when Davina goes live to the house and says " Housemates you are live on channel 4 please do not swear" (you can see where I am going with this) how are they going to stop Pete?

Well, they can't really stop him! I'm sure housemates have sworn when its been live in the past. I think that channel 4 has to pay a fine every time someone swears or something like that...which could be a lot if Petes nervous/excited, cause that's when he's likely to swear the most.

I've heard that the E4 'live stream' actually has a small delay to give time to remove uncalled for behaiviour should anything life threatening be broadcast.
Maybe the live C4 one has a slight delay , in case Pete has a sudden tic.

E4 do have a delay so they may do it with Channel 4 . They would probably have to do it with most programmes he has "live" interviews on as well.

surely if its after 9pm it wont matter anyway- they'll just do their usual 'Strong language from the start' gig.

It starts at 8.30 though doesn't it?

Maybe they can say "stick some tape on tourette boy's mush, and don't take it off until 9pm"

E4's live stream does have a delay of about 20 mins this is so they can stop any swearing being transmitted before the watershed or anything slanderous being said.
C4's programme on Friday will more than likely carry a 60 - 90 second delay so if they need to they can dip the sound.

I've heard that the E4 'live stream' actually has a small delay to give time to remove uncalled for behaiviour should anything life threatening be broadcast.
Maybe the live C4 one has a slight delay , in case Pete has a sudden tic.
I doubt it, as they didnt' stop him as he was going in the house :D