Chris

Preparing and selling "fully loaded" Kodi devices is a criminal offence (because wholesale copyright infringement is a criminal, rather than a civil matter). Serving unlicensed copyrighted material to systems like "fully loaded" Kodi is likewise a criminal offence.

Consuming content in this way represents at the very least, civil copyright infringement, and in some cases could be a criminal offence under the Fraud Act (obtaining services without payment - which would be the case, for example, if the system enabled you to view a channel like Sky Sports 1 without paying the subs).

Kodi itself, without the third-party addons generally known by the term "fully loaded", is simply a technical solution for easy sharing of content between devices you own. As designed and sold by its original vendor, it is not illegal.