A massive supermarket chain has “rebriefed” its home shopping delivery drivers after a concerned dad snapped a candid picture on his mobile phone.

Andy Tierney captured the incident as he challenged the driver of an Asda delivery van, who had parked his vehicle on yellow zigzag markings outside St Joseph’s Primary School, in Keighley, earlier this month.

But he said the driver didn’t seem to care that he was obstructing people’s view of the road, creating a potentially lethal hazard for young pupils.

He said he reported the incident to Asda’s Morley depot — which handles home deliveries — but had still not received a satisfactory response a week later.

He said: “I just think this is completely out of order.

“If a child were to run out from behind a vehicle parked like that, other drivers wouldn’t see them until it was too late.”

He said he had gone to the school, in Queen’s Road, to pick up his daughter.

Mr Tierney said it was busy because other parents were doing the same but added that if the delivery driver had waited five minutes there would have been space for him to park somewhere safe.

He said the van had been parked in Rawling Street, which runs down one side of the school.

He said this was not the first time he had seen motorists parking illegally on the zigzag lines along the kerb.

Mr Tierney, who is currently taking a college IT course, said he subsequently made several phone calls to different Asda departments but had yet to receive an explanation or apology.

In response to a Keighley News query, a spokesman for Asda said: “Quite frankly this shouldn’t have happened and we’re very sorry.

“Our delivery driver was wrong to park in a restricted area.

“All our drivers have been re-briefed so that they know where they should and shouldn’t park when they’re unloading our customers’ shopping.

“We can only apologise to Mr Tierney for the inconvenience and for not letting him know the outcome.”

Dorothy Hamer, head teacher at St Joseph’s, said: “The school is sited in a congested area “The majority of our parents are very supportive but we do have concerns with a minority who are causing a potential hazard to the children’s health.

“The local constabulary are very good at coming around and advising parents.”