Mr Herd's wife is expecting the couple's first child

A Health and Safety Executive (HSE) inquiry found gas from cutting equipment caused the Wolsingham blast.

The HSE has prohibited Ward Bros Plant Hire Ltd, of Darlington, from carrying the cylinders in closed vehicles until more precautions are taken.

Father-to-be Andy Herd, 33, was killed in the explosion on 26 May.

Residents were evacuated when windows in shops and homes were blown out and wreckage was strewn across the centre of the market town, near Bishop Auckland.

'Regular checks'

An investigation into the "underlying issues" leading to the explosion is ongoing, but in the meantime all users of oxy-acetylene equipment are being asked to urgently review their safety measure.

Pam Waldron, HSE's Head of Operations in the North East, said: "Whilst the investigation continues, it is important that all users of oxy-acetylene equipment review their cylinder transport arrangements.

The town centre was devastated by the powerful explosion

"Instruction and training of employees in safe operation, including regular checks of equipment condition and functioning, are needed to prevent any releases.

"In addition such gases are best transported properly secured in an open vehicle. If an enclosed vehicle is used, it should have adequate ventilation."

The explosion happened shortly after Mr Herd, of Mill Race, Wolsingham, stopped at a shop on the town's Front Street.

It is understood the vehicle was moving at the time.

An appeal fund has been set up for his wife Jennifer, who is expecting the couple's first child.

Wolsingham Parish Council said the fund would also be shared between families whose homes were damaged by the blast.