Here's my $0.02 worth, which I posted as a comment below the article on the Telegraph website:
Thanks for reporting on this, Mike. Spanx probably has a prototype in her basement for the lower half for us guys, too. However, she's too late on that count, as ActivSkin's already beaten her to it with their full support 'mantyhose'. You can find them at http://www.activskin.com/.
I've been maintaining a blog called The Nylon Gene for the past year or so, which documents the emerging men's legwear trend and how it's gradually catching on--albeit on the sly underneath the average guy at the office's trousers. See more at www.nylongene.com and let me know what you think.