Twins Lindsay and Erin Halls were in double trouble when they took buses into Cambridge – and thought one had an un-fare advantage over the other. The 13-year-olds from Lynn Road, Ely, pictured right, travelled into the city just five days apart ... but

Twins Lindsay and Erin Halls were in double trouble when they took buses into Cambridge - and thought one had an un-fare advantage over the other.

The 13-year-olds from Lynn Road, Ely, pictured right, travelled into the city just five days apart ... but Erin was charged £1.20 more than her brother for the same journey.

It left Erin with less spending money for a shopping trip with her friends Caitlin Morrell and Gemma Turner.

Her mum, Karen, said: "It irritated me. It seemed so unfair.

"Erin had taken £17 with her to buy a school bag and, after paying her fare and buying the bag she wasn't left with much money and could hardly get anything to eat."

Lindsay travelled into Cambridge on a Saturday and paid £3 for his ticket. But when Erin took the same journey the following Thursday, she was charged £4.20.

However, Stagecoach managing director, Andy Campbell, said an error had led to Lindsay being charged a cheaper fare in error - she should have paid the same as his sister.

He said: "There was an error on the system where the child fare was capped at £3. The mistake has been identified and corrected.

"The correct fare is £4.20 and we would like to apologise or any misunderstanding.