This isn't a complaint form or a petition.
If you're submitting this form you are asking for a review on the basis that the sentence is unduly lenient because the judge has made an error of law.
Not because you or I feel the sentence is too short, or because you feel the sentencing guidelines are wrong.
Because you believe the judge has made an error in law. Not in your opinion, in law.
People should understand exactly what it is they are claiming and to be frank I suspect 99% of posters who have "signed" (signed what? It's not a petition) don't realise exactly what they're doing.
As another PP has already stated, only one unduly lenient claim needs to be made for this to be passed for review. A mass campaign to sign isn't going to change anything because the test is whether the judge has erred in law, not in public opinion.