A Staffordshire steel supplier has created new jobs and expects to double its turnover after investing £2m to extend its existing manufacturing unit and grow its business.Steel Processing (Midlands) Ltd (SPM) said the 14,500 sq ft extension of its existing unit at Zone 4, Burntwood Business Park, would enable it to meet increasing demand for its products.The company has taken on 15 new members of staff as a result of the expansion, taking it to a total of 60. It is also on target to more than double its turnover to £40m this financial year.London & Cambridge Properties, which owns the business park, also carried out a number of improvements to the company’s existing 36,963 sq ft unit.SPM has now committed to the business park for another 20 years.