There is no such thing as a free lunch, and a free will might be not be very palatable either. Watch out for the will-writer appointing themselves as executors and then charging through the nose (normally ad valorem) to execute the will with the beneficiaries having no recourse or choice of the firm executing.
NatWest wrote my MiL's first will, and only when I read the small print did I see that they would have charged the thick end of £20,000 to execute her will even though her assets amounted only to a house (modest) and some capital left in trust to her children with her having a life income from it.
Before she lost her marbles I suggested she re-write it with the help of a local solicitor, who charged £350, including visiting her twice. He then executed it a year later at a cost of less than £5,000. The second will appointed my BiL and my wife as executors.