What it the penalty for using heroin in England?

Using drugs have never been a crime in the UK, it's actually just the possession of the drug that will get you in trouble.

The maximum sentence for possession of Heroin (which is a class A drug) is a fine equaling 150% of the offender's weekly income and up to 51 weeks in prison.

The maximum sentence for possession of Heroin with intent to supply is life in prison.