@markhowellsmead can you confirm the PHP version you’re using? That’ll help us quickly narrow down the issue and fix… thanks!
@markhowellsmead In looking at the error message provided, seems the plugin is installed twice. I’m seeing both safe-svg and safe-svg_old as mentioned directories. Curious if in testing the upgrade you kept the old plugin around and active? If so, that would cause the error you’re seeing and is expected. I’d suggest removing the old plugin or at least deactivating it to avoid this problem
Apologies, the plugin generated a fatal error earlier during an update and the hosting company “resolved” this by duplicating the folder. That meant that when I came to activate it, WP CLI tried to activate both. I’ve removed both and re-installed afresh, and all’s well. Thanks anyway!