The son of a millionaire lottery winner has been jailed for four years after an attempted robbery.

Colin Munro was part of a raid that resulted in a shop worker being smacked with a hammer.

Munro failed in an attempt to get his hands on the takings a decade after his now-late mother Catherine Munro scooped a £3.5m Lotto jackpot.

The 32-year-old appeared at the High Court in Paisley on Tuesday after he earlier pled guilty to a charge of assault with intent to rob. His accomplice Andrew Madden, 33, also admitted the same crime.

Judge Lady Scott locked each of them up for four years. She also ordered they be supervised for a further three years on their release.

The court heard how the pair targeted the Hillhouse grocery store in Hamilton, South Lanarkshire, last September.

Madden initially stormed in clutching a hammer with his hood up and a scarf covering his face. He immediately went behind the till and soon began grappling with shop owner Shahid Parvez.

Munro, armed with a knife and with his face also hidden, then ran into the store. He quickly turned on worker Mohammed Rafiq and started punching him.

Prosecutor Allan Nicol said: "Both (workers) were fighting to try to avoid being struck by the weapons the accused had."

A female customer and her six-month-old child meantime hid for their safety in the store. CCTV footage of the raid was shown in court.

Munro and Madden could be seen struggling as shelves of groceries end up scattered on the floor.

The duo eventually left and by this time their faces had been revealed after their scarves slipped down.

Munro then returned and struck Mr Rafiq on the head with the hammer leaving him cut.

The raiders then fled again towards nearby woods. The knife that Munro had been brandishing was left behind in the shop.

Police were soon on the scene and the two shop staff were taken to hospital. Mr Rafiq required treatment for a head wound.

Officers meanwhile were tipped off that two men had been spotted leaving the woods and heading towards a block of flats.

Police, with a sniffer dog, then traced Munro and Madden to a property there and detained them. Munro's mother passed away days after he admitted to the raid.

In 2006, she told how she was going to split her £3.5m fortune with family including Munro and her two other sons Barry and Craig.