Almost every episode involves a family with pretty average jobs living in your average 3 bedroom semi detached. They go to Australia and turn their noses up at massive houses because they don't have pools and walk in wardrobes. Or they're 10 minutes from the beach rather than right across the road
They never seem to want to start off a few rungs down from their eventual goal, it all has to happen right away.
They all want identikit houses too- those shiny kitchens and acres of cream carpet. I'd like to see one where the family was after something a little different personally!