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Four firms from an original list of six will be invited to bid for a £30 million design and build contract to upgrade the A1 between Tranent to Haddington in Lothian region, Scotland.It is understood that Mowlem, Morrison, Alfred McAlpine and Miller/Amey will pick up tender documents by the end of the month. Two other contestants, Amec and Barr, have dropped out.Sources say the Scottish Office originally said it would only invite bids from three out of the six, but later decided on four.The A1 scheme is likely to cost firms £500,000 for soil investigations alone, but it is expected the four bidders will share this between them.The fixed-price contract will comprise 12 km of dual two-lane with four grade-separated junctions and 10 structures.