British Expats - Newcomers Beware!

From the article

On Dec. 18, new impaired driving penalties take effect, and the maximum penalties for most of these offences will increase to 10 years from five. It means they will fall under the definition of serious crimes for immigration determination purposes.
This is the one that will be of interest to those who have Permanent Resident Status already in Canada and could be deported for a DWI/DUI in Canada.

Immigration officials could rule a person is inadmissible to Canada for "serious criminality," even if an impaired driving offence took place in another country.
This is the one that will be of interest to those wishing to emigrate to Canada either as a spouse, temporary worker/student/visitor or applying for PR under Express Entry or PNP.

Under federal immigration law, a permanent resident or foreign national can be deemed inadmissible if they have been convicted of a Canadian offence punishable by up to 10 years in prison, or of an offence for which they have actually been sentenced to more than six months behind bars.
In addition, the same rule applies to those who have committed an offence in another country that, if committed in Canada, would carry a penalty of up to 10 years.

This makes applying for citizenship even stronger.