Plans for a Tesco megastore in Wolverhampton were revealed yesterday as campaigners called for an inquiry into the "unfair dominance of the grocery market" by retail giants.
Under a deal struck with Wolverhampton City Council, the company is to build a 13,000 sq metre Tesco Extra store in the city centre.
Tesco Extra is the largest format in the retailer's portfolio and the Wolverhampton outlet is expected to employ 450 staff.
The development will also include a petrol filling station, additional retail and cafe units, 73 flats and a 1,000 space car park.
But last night the Forum of Private Business claimed action was needed to stop developments like this monopolising high streets.
The lobby group urged action "before it is too late".
"We have written to the Secretary of State, calling on him to use his powers to instruct the Office of Fair Trade to stop dithering," said Nick Goulding, chief executive of the FPB.
"We want him to order the Competition Commission to investigate the dominance of the giant retailers."
Mr Goulding claimed retail chains such as Tesco, Asda and Sainsbury were forcing smaller operators such as corner shops out of business at the rate of 50 a week.
Over the weekend, the OFT indicated it might Uturn on an original decision not to refer the grocery market to the Competition Commission for a full review.
Its plans for Wolverhampton also include developing the former site of the Royal Hospital in Cleveland Road into 430 homes and a new primary health centre.