Local authorities in the Midlands which were snubbed in the national shortlist for a supercasino now face an anxious wait to see if fresh arguments submitted to the judges can sway their views.

Solihull's National Exhibition Centre and the Ricoh Arena in Coventry failed to make an eight-strong shortlist of proposed sites in March.

Three of the region's local authorities have now sent in additional documentation to the Casino Advisory Panel, setting out "new and compelling" information as to why their site would be best for a new-generation casino.

The NEC's new submission hinges on the fact that the site has garnered the support of both Birmingham and Solihull councils, as well as the regional development agency, Advantage West Midlands.

"The new information puts more flesh on the bones of our original proposal and sets out how much stronger it is because of the partnership behind it," said a spokes-woman for the NEC.

"The unique location of the venue means it will pass the national test in terms of accessibility.

"The region is very well known for business tourism and with an airport on our campus international visitors will be delivered straight to our door as well."

Revenue from the NEC - up to £350 million per year in the first decade - could be used to fund a scheme to build a new stadium in Saltley, and the dossier highlights the wide-ranging nature of the regeneration benefits.

"This bid has a double impact in both Solihull and Birmingham," said the spokeswoman. "We weren't able to include the creation of a city stadium in the first bid because at the time there was a separate proposal for Birmingham.

"We also included information about how the stadium could offer additional facilities for athletics during the London Olympics."

Coventry City Council was also keen for the panel to reassess the strength of its case, and sent out its additional submission by email, courier and fax.

"The Ricoh Arena has got planning permission for a casino and cleared all the regulatory hurdles," said James Russell, head of planning and transportation strategy at Coventry.

"It could be open in nine months. Nobody else is in a position to guarantee that.

"We also pointed out that there is nothing from London to Sheffield and the NorthWest and we think that is a blow to the Midlands."

Although Dudley failed in its bid for a regional licence for a gaming complex at Brierley Hill, it made a second shortlist for large or small casinos.

The bidders should find out in a matter of weeks whether the panel has been convinced by their fresh arguments.

But panel secretary Valerie Curtis warned that their chances of success rested on the information being genuinely new.

"They can't have just looked at the other bids which made the shortlist and tried to make theirs better," she said.

"The information which will make a difference has to be new and compelling."