Dip in the pool

Eva: I wish we had a pool in the back garden.
Mom: Under a nice big conservatory to keep the rain out.
Dad: It would be very expensive.
Tom: Yeah, like a billion pounds.
Dad: Probably more like a hundred thousand.
Eva: What if we just had a cacuzzi?
Mom: Yes a cacuzzi would be be nice. But it's called a jacuzzi.