where is this? In America, the beneficiary stated in the most recent policy update and given to the insurance company in writing controls, not the Will, -- the proceeds pass outside probate and are not subject to attorney's charges.
It is, however, possible for the Probate Court to seize the proceeds of a life policy for the benefit of creditors IF/WHEN it can be shown that the policy was purchased when decedent was already in debt and that the policy was a means to avoid paying said debts. {A mortgage debt holder can not sue for this since its value is secured by the property -- unless it also shows fraud in the incurrence of the mortgage debt.}
Since you use the word "solicitor" I assume you are not in America. That does, however, leave a variety of countries in which this might be a concern