As others have said; do not use NWNF companies. They are out to get you some money so they can get their cut, but not necessarily get you what you should be entitled to as that would take too long and be too time (and money) consuming for them.
DD was seriously injured in a road accident where the driver causing the incident drove on, so was unknown. She went to a local firm of solicitors with a specialist personal injury section, with experienced appropriately trained staff. They did a terrific job for her. They were very thorough in taking her through all the aspects of her future life that would be affected by her disability, including many aspects that hadn't occurred to her or us, not just practical side effects of the injury but how it affected her work, her promotion potential, the extra cost of needing to drive a car with automatic transmission. They explained to her how her compensation would be calculated and made their own estimate of what she should receive and advised her to reject the first offer made to her as insufficient, they then negotiated a considerable increase. She received substantially more money than she expected.
She did not pay any fees, these were met by the Motorist's Insurance Board who paid out on her claim. She would only have paid fees if her claim was unsuccessful