"Professor", Hughes did some earlier work on how expensive the gas backup to wind was, which was published by that former Tory Chancellor's so called think tank. (I refuse to clutter up my mind with their names!)
It was extensively and conclusively debunked by Robert Gross of Imperial, who gave evidence to the relevant Parliamentary committee.
I commented on the FT. http://www.ft.com/cms/s/0/2e0945e2-4a09-11e2-8002-00144feab49a.html#comment-3447592