"by-election later in 1997" . . "1997 Beckenham by-election" . "1997 Beckenham by-election" . . "Beckenham" . "by-election" . . "1997 Beckenham by-election" . "1997 by-election" . "the by-election in Beckenham" . . . . . . "a by-election in November 1997" . . "Beckenham by-election" . . "21 October 1997" . . . . "1997-11-20" . "1997" . . "20 November 1997" .