The thing is about defence of necessity/extenuating circumstances etc allowing someone to keep their licence, is that is should be vanishingly rare - it shouldn't even exist, IMO. The only response to someone trying to claim it is "tough shit", surely?
I lost my licence completely out of the blue and with no notice at all/immediately, which took away my independence (motability vehicle), had a huge impact on my life and I would have lost my job if I was still employed. My DCs had to give up certain activities, I couldn't provide care for my elderly parents, I can't get to the specialist hospital I'm under as there is insufficient public transport. Taxis are really expensive here and we are a low income family. Public transport generally is shit round here anyway and some is inaccessible to disabled people. It's fucked my life.
But at the end of the day it's simply tough shit for me. There is no leeway at all for epileptic drivers and looking at it objectively, there shouldn't be. It doesn't matter that I lose my job or my parents don't get any care etc - it's completely irrelevant. I'm not allowed behind the wheel.
And it wasn't a choice I made, it wasn't my fault in any way. Drink drivers however actively choose to put themselves in that situation so to hear someone (and I know the drink driving wasn't the action of OP but she was hoping for this defence) trying to wheedle extenuating circumstances to avoid a ban, is to me very infuriating.
I posted in support before for @berks
and I mean it. I genuinely feel sympathy as I know her life is going to get a lot more shit and her DH caused this not her. But his behaviour is indefensible and giving reasons he shouldn't be banned is not good and I really think should be avoided, as apart from the moral considerations, it means people won't be as sympathetic to her which is shit. @berks you will get a lot more support and sympathy if you accept he should lose his licence. Doing this will also help reinforce your anger at his behaviour, and you should be angry! It's not you and him against the world hoping he will keep his licence, it should be him accepting he will and should lose his licence and trying his best to make this as easy for you as possible and being genuinely apologetic.
"Don't worry honey, I'll explain to the court why I shouldn't be punished because if I they do I would lose my job and we would have no income and it'll be awful for you and the DC. So they should let me off for your sake"
OR
"I'm so sorry for what I've done. I know there is no excuse and I will lose my job and we will have no income and it's going to be awful for you and the DC. I'm so sorry I will do everything I can to find alternatives and I'm sorry I have deliberately put you and the DC in this situation"
(I said before this would be a deal breaker for me and it would due to the selfishness and stupidity)