British construction firm Balfour Beatty has reaffirmed its rejection of a merger proposal from rival Carillion, it said today.               

Balfour Beatty said it had further considered yesterday's announcement from Carillion. 

"The proposal remains unchanged to that rejected on August 11, 2014. The board reaffirms its rejection of the proposal," Balfour said. 

Balfour has rejected two proposals by Carillion to create a £3 billion group better placed to compete for major international contracts against the likes of Spain's Ferrovial. 

Carillion has until August  21 to make a final offer.