Prudie, A Place in the Sun is smoke and mirrors, too. It would take far too long for the negotiating to be filmed on camera - one glass of orange juice wouldn't be enough.
So, the negotiating happens off camera - don't forget the presenter phones the estate agent who has to contact the seller, it might take hours or days.
What we see is the presenter phoning a crew member to recreate the deal. The buyers don't know the final outcome before filming, though.
The presenters don't find the properties, either.