The judge must consider both 'harm' and 'culpability'.
If both factors are 'high' then it's a 'Category 1' offence, with a starting point sentence of 3 years, and with the judge expected to pass a sentence of between 2 years 6 months and 4 years.
If only of those factors is 'high', with the other low, it's a 'Category 2' offence. The starting point is 18 months, with a range of 12 months to 3 years available to the judge.
If both factors are 'low' it's a 'Category 3' offence, with a sentencing range of a 'high level' Community Order and a range extending from a 'low level' Community Order up to 51 weeks imprisonment.
The above guideline sentences assume that it's a first-time adult offender, who has been convicted after a trial. Previous convictions can push sentencing higher but an early guilty plea can see sentences reduced by one third. Judges may sentence outside of those guidelines but only in exceptional circumstances (which the judge must explain in open court).
See pages 8 to 10 here:
http://sentencingcoun...ine_-_Crown_Court.pdf
Chris