A woman has won a £2.5m jackpot just weeks after she netted a five-figure sum with the same bookmaker.

William Hill said the latest prize was the biggest won by one of its customers.

The punter, a single mother from the north of Scotland, described the win as "surreal" and said she had initially hoped to net just "a couple of quid". She now plans to splash out on a holiday for herself and her son.

The woman, in her early 40s, became a millionaire on Valentine's Day when she scooped £2.5m with the Festival Of Lights Vegas online casino game.

The "life-changing" accumulated jackpot had been building over an 18-month period, William Hill said.

It was her second recent celebration after she won £30,000 on an online game with the bookmaker three months ago.

The woman, who works in a school and wants to remain anonymous, has already booked a trip to Walt Disney World for herself and her seven-year-old boy but otherwise has no idea what she will do with the winnings.

She said: "I was washing the dishes this morning and thought to myself 'no matter how much money you have, you still have to wash the dishes'.

"It is all still so surreal. You obviously play these games, hoping to win a couple of quid, not a couple of million. I'm still stunned."

A spokesman for the bookmaker said: "This, by our reckoning, is the biggest sum that a William Hill customer has ever won. It is an incredible, life-changing sum of money."