It could be anything from 1 year up to life for GNM. It looks quite complex with determining culpabilityAnyone have an idea of the sentence they will get?
My guess would be probably very high culpability (category A) and almost certainly cat B, so starting point would be 8 or 12 years, then prosecution and defence will put forward aggravating and mitigating factors.
Gross negligence manslaughter – Sentencing
www.sentencingcouncil.org.uk