Roger, who works Darkstar Ltd is extremely proud of his invention and cannot wait to share it with his good friend Mark, who work for another firm. He takes the software and a prototype of the modified spray gun home for the weekend and sets it up in his garage to show Mark. Mark, who is an engineer, is impressed by the effectiveness and simplicity of the system and tells about it the following Monday to Charlie, the head of the Research department at his work place.

Darkstar Ltd wishes to exploit this new technology and to protect it against competitors. They seek your advice as to the chances of success in obtaining a patent for it in the U.K.