2016-2018 Range Rover MkIV / L405
Sorry for the delayed reply.Can you please explain the steps you took to unscrew the bottom part?
The bottom "screw" part is the same diameter as the filter, so it's easy to just reach under the bottom and start turning it. Fits right in your palm. I didn't have to remove any brackets or hoses to reach it (if my memory is correct.) Be aware that because it threads into the bottom of the filter you'll likely get a palm full of fuel as well.