It’s a legitimate will writing company, a large established business. I have my will with them and they are a good company to do business with. They are very friendly, one phone call to tell them you are not interested and they will take your details off of their system.
I clicked on a £47 Will writing offer on Facebook and should never have completed the form for more information. They ring relentlessly. I answered once and they asked for the money up front over the phone there and then, I declined.