Thanks for your question. I totally get the concerns around mitigating circumstances, and I’m so sorry about your loss. I also lost my dad just before the application season opened, so I can relate to the pressures of balancing personal life struggles with university.
The first thing is that overall, you still have a 2:1 in your degree, which is very good, and on a basic level, you directly meet the criteria most law firms look for anyway. Often, law firms will look at this overall grade and not specific module grades, though I have heard of a couple of firms that do look at individual grades. Regardless, this should not put you down because (1) I know of many people who have gotten some 50s in individual modules but still secured training contracts at very prestigious firms, and (2) the mitigating circumstances section allows you to disclose the bereavement.
Next, your other achievements and extracurriculars heavily tip the scale away from grades, and I’m sure you know by now that law firms care about more than just grades. You have to ensure that the other parts of your candidacy are strong, and this starts with even the basic concept of writing good applications. Are your motivations clear and backed up by specific examples? Have you accurately shown your journey? Are you directly answering the application questions? Are you using clear language, because overly convoluted wording can put recruiters off?
By incorporating all of this, you are in a very strong position to succeed, despite those individual module grades, as you still have a 2:1 overall.