If you've looked at the pic from the link I gave, you'll see how many bolts hold it on. Find them and soak them in penetrating oil, daily for a week. PlusGas is still good stuff for that.
If you are going to swap the whole thing complete, it'll be a bit heavy, but you'll probably only have to disconnect the brake hoses and cables. While you're underneath you'll see what else might need to be removed, probably the exhaust.
If the donor and recipient are not the same spec, e.g. one's a normal car, the other a Sporting, you'll need to swap springs over. Not sure is brakes are the same.
Don't consider covering it up. The reason it is an MOT failure is because it is safety related. You should always consider the MOT to be a good thing, not bad. A skilled technician will inspect your car and effectively tell you if it is safe to use. If it fails, it has been unsafe or illegal for a while. Don't blame the messenger. I'm always happy to find an MOT tester that is strict, rather than one willing to let things go.