Because someone received X amount for an injury does not mean that this will be a blanket figure, there are a lot of others issues to take into account.
As a rule of thumb, injuries are classified into minor, moderate and serious, and which category an injury falls into depends on any ongoing problems, how quickly the problem resolves itself and what the long term prognosis might be.
There are then factors such as loss of earnings, incapacity, pain and suffering, out of pocket expenses, and so no two claims are ever the same.
This is why so much importance is placed on the report from the independent medical examination.
Some solicitors (particularly those who run cases on behalf of insurance companies) do undervalue claims simply so that they can get the claim off their books, get paid and move onto the next case.
But if your case is being handled under a no win no fee agreement, then they will usually fight your corner for the maximun that they can get, and are best placed to give you an accurate figure on what the claim is worth.
As I say, just because someone got over Â?4,000 does not mean that your claim is worth the same value.