Macclesfield's B&Q has promised to change its trolley system after a dad’s parked car was rammed while his partner and toddler were in it.

Robert Hirst, 32, came out of  the store to find three runaway trolleys had rolled down the sloped car park hitting three cars, including his Ford Focus.

His son William, three, and partner Claire Hope, 32, were shaken.

Mr Hirst, who works off-shore for Shell UK, said: “A trolley had rammed the car, scaring my son and damaging my windscreen mirror. 

“The manager said it happened all the time. The car park is on a big gradient and there were trolleys everywhere.

“I often see them rolled into the road. In fact if my car hadn’t been there that’s where it would have ended up.”

B&Q told the Express it was introducing a coin system to encourage customers to return trolleys to a bay.

This was not mentioned in the company’s letter to Mr Hirst.

The letter said: “Customers use our car parks at their own risk and there are signs to indicate this.

“We do not feel we can be held accountable for the actions of others who use trolleys and do not return them to the designated area or secure them in such a way they will not cause damage to other vehicles in our car parks.”

A spokesman for the store apologised and said trolleys were cleared regularly.

Yesterday, a spokesman apologised again, adding: “The majority of our stores have a coin-operated trolley system

“The Macclesfield store is in the process of adopting the same system.”