The (2017) logotype has not changed much in the 160+ year span that Boots has been in business. The brand as it stands is trusted by many, but is seen as outdated.
Boots is an icon, and the brand should be reflected as such, in a single iconic mark. The goal of this rebrand is to help Boots come across more progressive, modern, and approachable, with an emotional appeal.
A few years after graduating university, Boots actually underwent a rebrand executed by Coley Porter Bell. I invite you to read more about this to see how Boots has evolved by checking out the 2020 rebranding of Boots here.