Manjaro Installation Key Issues

Just started using Manjaro and pacman. I attempted an install of sublime-text using the pacman install instructions and seem to have added a dodgy key. When I try an perform another command I keep getting something like: Preparing... Synchronizing package databases... Refreshing core.db... Refreshing extra.db... Refreshing multilib.db... Refreshing sublime-text.db... Downloading subli (sublime)... Failed to prepare transaction: invalid or corrupted database Error: sublime-text.db.sig: sublime-text: signature from "Sublime HQ Pty Ltd " is unknown trust invalid or corrupted database (PGP signature) To be honest at this stage I'm not even that bothered about being able to use sublime-text, just trying to get to a place where I can use the package manager. Any ideas? How would I go about removing this key?