If your daughter already has insurance in place, probably best phoning them to see what difference it makes.
The company I work for equates to 1 years NCD (or it did a couple of years ago when I worked in the Sales/Service Centre). When I passed my test 4/5 years ago, my initial premium was £1,500. When I passed Pass Plus it dropped to £900/£1,000. I'd imagine the discount relates to the premium so the bigger the premium, the bigger the discount.
The company I work for equates to 1 years NCD (or it did a couple of years ago when I worked in the Sales/Service Centre). When I passed my test 4/5 years ago, my initial premium was £1,500. When I passed Pass Plus it dropped to £900/£1,000. I'd imagine the discount relates to the premium so the bigger the premium, the bigger the discount.