As mentioned in the Creation thread, it looks rather as though Nigel and Leo Mansell may be taking more of an interest in sportscars - with some corroboration in Motor Sport (attribution from KA). There's also been some speculation linking the Mansell name and a Zytek in the ALMS.
http://www.motorsportmagazine.co.uk/...ess-whos-back/
I must confess Mr Mansell never struck me as a sportscar kind of driver, but I'd be delighted to be proven wrong, and a showing at Silverstone might be just the thing to bring in the crowds.