It strikes me that this is quite a complex issue will multiple facets to it in terms of the sentence side.
For my money a disqualification from driving for 14 years is rubbish. The individual in question was driving not a little bit over the limit but more than 50mph over it, that is extraordinarily reckless. If this was the only instance on record of such behaviour then perhaps a 14 year disqualification along with an enhanced re-test would be suitable. But we know that it isn't and that they had previously filmed themselves speeding in Dubai, previously had a conviction for driving without insurance and had been spoken to by police a few months prior to this incident about racing on public roads. Considering the seriousness of the accident, the level of recklessness along with the previous behaviour I'm far from convinced that they should be able to drive on the road legally.
I appreciate the comments about the enforceability of removing someone's driving licence and the potential impact on someone's employment and social life considering that this country is backward in many respects when it comes to public transport but I'm not sure that a) just because something is difficult to detect is a good enough reason to simply give it a pass and b) making it harder for someone to access work and social prospects should be a concern when an individual has shown themselves to be so unsuited to driving around large metal boxes capable of killing and maiming people. Plus there are places that is perfectly possible to exist without a car in the UK. Manchester, Birmingham and London are three obvious examples. But even plenty of larger towns still have reasonable bus networks. It might be awkward but we're not necessarily consigning someone to being unemployable and a social outcast forevermore.
On the prison sentence side I struggle a little more. 100% this individual should have received a custodial sentence. End of discussion. When you're reckless behaviour (and not for the first time) causes the death of another, the death of an unborn baby, brain injuries with uncertain long term outcomes for two other children and a third child who I'm sure will struggle with the mental health impacts of what they saw and went through during and afterwards you need to go to jail. A community order or suspended sentence is not sufficient. Perhaps if it had been a momentary lapse of attention whilst driving at the speed limit for a driver with an otherwise unblemished record there would be some wiggle room. But that is certainly not the case here.
But on the length of that sentence I do struggle a little bit. I get the intrinsic desire to give them a life sentence with a decent minimum tariff but this wasn't murder. The driver didn't set out to kill and injure and tear multiple families apart. They were reckless in the extreme but it was still an accident.
With the state of prison system we now have after a decade of neglect (and arguably longer even than that) about the only thing it is good at is the punishment aspect of depriving someone of their liberty. I don't think making them suffer whilst their in prison is anything other than retribution rather than punishment (I'm not arguing for holiday camps, but clearly the main part of the punishment is the deprivation of liberty). But with our prisons designed and built by the Victorians, staffed by underpaid and badly motivated staff, with limited facilities? That's all they're really capable of. So we punish someone and then release them back into the wild to do what? Struggle to find employment? Deal with the drug habit they've picked up (see previous understaffed, under-resourced and poorly designed prison issue)? Basically be a problem for society for evermore?
I don't know if 12 years is the right length of sentence, it does feel light to me considering the severity of the outcomes (two dead, two with likely life altering injuries, one with probably mental health issues, families torn apart), but I'm also not sure what would be achieved by locking them away for longer, other than adding additional punishment and sating the lust of the baying mob, considering the current state of our prison service means that it isn't capable of doing anything else but punishing (and sometimes destroying lives).
It's tricky. I'm not sure it's helpful to just say "HE SHOULD HAVE BEEN LOCKED AWAY FOR DECADES/LIFE!". We need to have a better discussion about the appalling state of our criminal justice system which is failing everyone at every level. From victims, to perpetrators, to the innocent, to the families of all three of the forgoing, to those who work within it, and on and on. It's a disaster area.
But I guess it's easier for a politician to come out with nice shiny new law (which often actually doesn't change anything as the offence was already criminal just under a non-specific statute) to show how they're "tough on crime" and get a nice headline in the Mail or other media outlet rather than actually engaging with the myriad problems with our justice system. From the issues with actually catching and prosecuting criminals, to the delay in getting cases listed and dealt with, to the issues with a lack of effective representation because of cuts to legal aid (and if you self-fund are found innocent you won't be able to reclaim all your legal fees, so you can be ruined financially even if you're not guilty), to the poor state of our prisons, to yes, just what is our justice system for and how do we balance the punishment:rehabilitation equation and on and on and on.
Edit: Put the wrong length of time for the prison sentence.