The answer is below. Which SVR general manager said: "Looking only to a much shorter period of time it may be that some preserved lines disappear with only a relatively small number of the ones we see now operating managing to remain in business. That total could maybe only just reach double figures." No, the other one! Alun Rees, apparently channelling his inner Michael Draper. I found the quote (from an article in Heritage Railway magazine, December 1983) when looking for something else.