The Buncefield Investigation Board has been tight-lipped over the possibility of criminal proceedings ever since the 2005 blast.

A year ago investigation manager Taf Powell said a decision was 'on the horizon' but now sources claim it will be September.

In a statement the board said: "We understand from the investigations manager that no decision has been made as to whether any criminal charge will be brought against any person."

Meanwhile, lawyers acting for Buncefield victims will be returning to court later this month fighting to retain a voice for local residents.

Legal moves are under way that could see residents lose their voice in the battle for compensation for the disaster.

At the last hearing the judge in the case indicated he wanted to see a single set of lawyers representing the various insurance firms, big companies and residents hoping to claim damages from Hertfordshire Oil Storage Limited (HOSL).

Collins Solicitors, which represents around 260 householders, believes such a move would leave residents high and dry if the large companies involved opt for an out of court settlement.

The firm will be at the High Court on May 23 attempting to persuade the judge to think again.

Danielle Holliday, of Collins Solicitors, said: "We've had a number of letters from residents saying how angry they are.

"We're going to exhibit them on May 23.

"It's outrageous they're going to be denied access to justice."

A trial is due to begin in October to decide liability for the disaster.

HOSL, a joint venture between Total and Chevron, owns the part of the depot where the disaster took place.

The company is facing almost 4,000 claims totalling around £600million for damages connected with the blast.

Meanwhile, planning chiefs at Dacorum Borough Council tomorrow (Thursday) will be considering an application from Total to store fuel at the depot again.

Total is also seeking retrospective planning permission for an existing pipeline link-up to Heathrow.

Officers have recommended approval for both applications, but on condition storage is limited to aviation fuel, which is less volatile than petrol.