A 45-year-old man accused of a machete attack on a dad out celebrating Father’s Day in Anglesey was jailed for 14 months on Tuesday.

Iwan Roberts, of Mona Street, Amlwch, was told by a judge what happened at the little town was akin to a scene from the “Wild West”.

Judge Huw Rees at Caernarfon crown court said: "Society won’t tolerate people arming themselves with knives. Whatever happened in the public house and whatever rough treatment you received, there was no excuse for arming yourself in this way.”

Roberts pleaded guilty to assault causing actual bodily harm, possessing the machete and two knives, and possession of an offensive weapon – an improvised cosh and chain.

Judge Rees said 42-year-old Christopher Pritchard had been celebrating Father’s Day with his 12-year-old son in June at the Market Tavern and his wife was working behind the bar. Roberts had been asked to leave because he had turned up carrying his own drink.

The court heard that at one stage Roberts had threatened to stab Mr Pritchard and he was ejected from the pub. Mr Pritchard and his son were about to enter a taxi, later, when the judge said the defendant “slyly“ drew the machete and a metal pole. He struck Mr Pritchard on the arm with the machete.

Judge Rees declared: "He was very lucky to receive only minor bruising to the left forearm.”

He and his son ran off and customers from the public house intervened.

The judge said what happened was “truly astonishing”. A five-year restraining order was made and the weapons must be forfeited.

Prosecuting counsel Ryan Rothwell said a wooden bat and the pole were found at Roberts’s flat. The victim said he had been targeted in an unprovoked attack. “I consider myself very lucky to be alive. The attack has had an overwhelming impact on me, “ Mr Pritchard declared in a statement.

Roberts had been behaving in a “strange” manner and had previous convictions.

Simon Rogers, defending, said: "He understands the seriousness of what he’s done and is remorseful.”

Historically, he had problems with heroin but he was now on methadone. A combination of factors may have led to his behaviour.

Judge Rees told Roberts: "You have been given opportunities by the courts over the years including a drug treatment order.”