Yes Eddie has it about right.
The maximum was raised from 10 years to 14 years in 2004, VHG.
When looking at the sentencing guidelines this offence probably falls into the middle category seriousness for the offence (“driving that created a substantial risk of danger”). You can have a look here:
http://www.cps.gov.uk/legal/s_to_u/sentencing_manual/death_by_dangerous_driving/
The “starting point” when considering sentence is 5 years custody and the recommended sentencing range is 4 to 7 years. Bearing in mind Mr Munce pleaded guilty (and was so entitled to a one third reduction in his sentence) his pre-discount sentence was six years, which seems to fit the guidelines nicely.
The "needlessly distracted" remark is not very well made. What I think the report means is that he was distracted needlessly by his own actions (i.e. farting about with a phone when he should have been concentrating fully on driving).