Richard Lacey, 70, appeared at Llandrindod Wells Magistrates’ Court this week, where he pleaded guilty to a single charge of drink driving, in Powys, last month.

Lacey, who is now retired but revealed he actually helped design breathalysers when he was in employment, had to use one of the devices after police were called to the scene of a road traffic collision on the A479 near Talgarth on November 23.

Lacey had mounted a roundabout in his Peugeot 208 Gt Puretech, damaging a wheel and leaving the vehicle completely immobile.

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Representing himself at the hearing, Lacey said: “I’ve really got nothing to say. I misjudged how much I’d drunk.

“I had a couple of glasses of wine with lunch and a few pints of beer.

“I’m retired. I designed breathalysers and used to work with the police.”

Lacey was disqualified from driving for 13 months; he can reduce this ban by 13 weeks if he completes a drink drive awareness course.

He was also fined £600 and told to pay a £240 surcharge and £85 costs.