The "no plea" may be a ploy, part of a tactic to plead guilty to a lesser offence?
From Sentencing council guidelines (my emphasis):
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The maximum prison sentence the court can impose for causing death by dangerous driving or careless driving under the influence of drink or drugs is 14 years; for causing death by careless or inconsiderate driving it is five years; and for causing death by driving whilst unlicensed, disqualified or uninsured it is two years. The maximum sentence is reserved for rare cases where blame is exceptionally high.
For some offences of causing death by careless or inconsiderate driving or causing death by driving whilst unlicensed, disqualified or uninsured where the offender is not considered to pose a danger of re-offending and the level of fault is low, a community sentence may be deemed a more effective form of punishment and rehabilitation than imprisonment. In some cases where the level of fault is very low the offender may be fined.
If the offender pleads guilty the sentence will be reduced by up to one third depending on how early the plea was made.
All sentences will include a minimum period of disqualification from driving followed by:
- a compulsory extended re-test for causing death by dangerous driving or careless driving while under the influence of drink or drugs; or
- a discretionary re-test for causing death by careless driving or while unlicensed, disqualified or uninsured.
The disqualification period runs from the sentencing, or enforcement if earlier (not from when an offender is released from prison).
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https://www.sentencingcouncil.org.uk/wp-content/uploads/FINAL-Death-by-driving-sentencing-leaflet-for-web1.pdf