You've received lots of useful answers but I'll restrict mine to answering the actual question within the title of your post. (i.e. "What's the sentence?")
Here's the document which judges must refer to when considering sentence:
http://www.sentencing...inst-the%20person.pdf
The table on page 13 deals with 'Section 18'. See page 15 for 'Section 20'.
The sentences shown there refer to a first-time offender convicted after a trial. An early guilty plea can see the sentence reduced by one third but previous convictions can push the sentencing range higher. Unless there are very exceptional circumstances (which the judge must explain in open court) the judge has to stick to the guidelines in that document.
Chris