Gyllenhammar has upped his holding to 3.2 million shares after buying 400,000 shares, and now owns 15.7 per cent of the fibre and coating supplier. The firm is now valued at £4.6 million.

 

The illusive financier, who was last photographed publicly 20 years ago, has been investing in under-valued Yorkshire quoted companies, including Leeds Group, Yorkshire Group and Jarvis Porter.