Is it worth refusing a roadside breath test?

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The short answer is 'no'. 

Under the Road Transport Act 2013 a police officer has the power to submit you to a breath test if they believe that you were merely driving a car. If requested to submit to a breath test and you fail or refuse to submit, the officer may arrest you and take you to the station to submit to a breath analysis. 

If you refuse the roadside breath test this is a separate offence - max penalty of a fine and possible disqualification period at the court's discretion. 

If you refuse the breath analysis this is the same penalty as a High Range PCA. 

It is not worth compounding the problem by being charged with a PCA offence or Refusing to submit to a Breath Analysis as well as Refusing to submit to a roadside Breath Test.