EDIT: See post below by scott118, apparently he has. A quick search online suggests that was not the only time.
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Yes, but without the massive public pressure and encouraging growth in passenger numbers there's a far greater chance that the Government would have chosen to close the route. Without the campaigns and TUCC hearings there is every chance they could have done so much faster, too.
Saving the S&C was the work of a number of people, not one man (though as noted, the efforts of Ron Cotton, a BR manager not a "placard bearing enthusiast", must surely be considered critical to the ultimate success of the campaign), and Portillo's contribution was comparatively small but, yes, ultimately crucial.