I am expecting 4th baby, we could just try to modify our existing 5-seat car to have 2 extra seats in the current boot space (7 seater conversion). Dozens of companies on the Internet sell kits to do this, they usually insist it will be legal and insurable -- is it actually safe? Any other experiences?
One friend said that her DC were frequently carsick when they tried using an estate with 7 seats. We don't actually use the car that much, so wondered if we could get away with it, cheapest option by far.