The one liners from Dec seem slightly lost on Holly, who to be fair looks fab, but I am not sure the presentation overall will be as funny,
I don't think anything is lost on her to be honest. If you watch her and Phil on This Morning, she is as sharp and witty as they come - sometimes a bit filthy. And then of course you see that side more of her on Celebrity Juice, where she is not as outlandish as the host but can take a joke and give as good as she gets.
I wouldn't be fooled by the appearance! Her and Ant and Dec are good friends - they are often seen socialising via social media, so she will get Dec's humour as well as anyone else could in Ant's absence. Added to the fact she will have seen the script and know what is coming.
She is shit scared of anything that isn't a kitten, so she will struggle during the trials and whilst it is funny now, it could wear thin and take away from the contestant's trial experience. Hopefully she gets brave as the series wears on.