Sounds like there is a very good chance he will serve prison time, from the statements of the Judge. Eligible to be sentenced up to 2 years and unlimited monetary fines.
From The Sun article and the blurb I just heard on BBC Radio, it also sounds like prosecutors botched up on the variation of manslaughter they chose to charge under. Judge would have accepted a 10 out of 12 conviction, but they couldn't hit that threshold. Guess his "brakes wouldn't matter" claim worked.
"If you drove your car really dangerously and at very high speed, you might get prosecuted for what's called gross negligence manslaughter. You might."
"But this defendant is not getting prosecuted for gross negligence manslaughter, he is getting prosecuted for unlawful act manslaughter."
https://www.thesun.co.uk/news/429582...on-kim-briggs/ (NOTE: some sidebar ads in the link may be very NSFW)