We know a man who can...     Charity organizers are waiting anxiously to learn who will benefit from a £34.000 donation from Sir Colin Marshall whose chairmanships include British Airways and the Confederation of British Industries.  This is the anticipated amount which each of the full members of the Royal Automobile Club hope to receive when the sale and demerger of the RAC motoring services takes place.  Sir Colin was made a member overnight at the end of 1997 without complying with the normal 6 month qualifying period in anticipation of becoming the new chairman of the RAC, although the chairmanship has passed to a rival candidate it appears that he intends to remain a member until the sell-off is completed.