Well, the first thing that I should say is that a 2.2 is not a fail. You still have plenty of options even with a 2.2. When I was applying for graduate jobs I have seen plenty of jobs that ask for a 2.2 as a minimum or accept candidates with any grades. It is true that a 2.1 will keep more doors open, but a 2.2 is also not going to completely limit your options. Also, a lot of the times, employers do consider mitigating circumstances when they ask for your degree classification, so that is usually taken into consideration.
But another thing that I want to say is that employers actually don't place as much emphasis on degree classifications. I have recently applied for a role which required a 2.1 and they didn't even ask me to provide them with a transcript or a certificate or any evidence that shows that this is what I have achieved. They just ask if you have it and that's it. Your grade is only used for the initial screening, but what matters more is your motivation, skills gained during university and your overall preparation for interviews e.g using the STAR technique for competency based questions and making sure that you can answer the most common interview questions fluently. Some companies will be more strict about the grade, but honestly, if the company uses degree grades as a measure of someone's ability to do the job then they're complete idiots and not worth your time anyway. One company did ask me for a final degree mark, but honestly it's dumb, because we all study different subjects.