 A serious incident involving hooliganism before , during and after a match against Millwall in 1985 caused the club 's then chairman , Conservative MP David Evans , to introduce a scheme effective from the start of 1986 – 87 banning all visiting supporters from the ground , and requiring home fans to carry identity cards when attending matches . Conversion to an all @-@ seater ground also began in 1986 . Away fans returned for 1990 – 91 , and grass a year later . The David Preece Stand was erected in 1991 , and the conversion of the Kenilworth Stand to an all @-@ seater was completed in 2005 . 
