Looks like I am reactivating quite an old topic, sorry - I haven't been around for a while
My company did "I Want That House" with ITV, so I know the format pretty well.
Firstly, forget the idea that the purpose of the show is to find the right property for the customer - the producers try to dictate which properties should be featured - even to the extent that we were pressured to show a property 1.5 hours away from where the couple were looking to buy. In the end we didn't, and the 'clients' confirmed later that they would never have bought there in a million years! The property was lovely, views perfect for 'wow' TV and that is the problem with these shows. They want to make good TV first, find the right property a distant second.
Filming is horrendous - 15 takes to get the right expression as the customers enter the bathroom (and you have 3 properties, 3 bathrooms minimum, maybe 15 bedrooms etc etc).
All in all, take it for what it is - a television programme rather than a totally genuine quest to find the right property for the customer, and enjoy the scenery
Scunner
*Edit to remove unauthorised Sig Briar