Hi Graham
Cambridgeshire Library lists its available databases. There are only two in the genealogical section, Ancestry and the Cambridge and Local Studies Catalogue. However in there are treasures in the other sections; biography includes Crockford's Clerical Directory, the Oxford Dictionary of National Biography and Who's Who/Who was Who; and newspapers and periodicals includes British Newspaper Archives, the Guardian (1821-2003) and the Observer (1791-2003), and the Times Digital Archive. You can also access Official Publications On-line.
All the best
Gobbo