A former pensions adviser to Boris Johnson is looking to rescue Tata Steel&rsquo;s &pound;15bn pension scheme,Sky News has reported.<br /> <br /> Edi Truell, a city financier, is seeking to become a trustee of Tata Steel&rsquo;s British pension scheme. Following his bid for the company&rsquo;s operations last year, Truell has written to trustees with a renewed offer aimed at saving the pension scheme.