I had a search through BBC Genome
QED: I'm Not Stupid - BBC 1 - 25 April 1995
Watchdog Healthcheck - BBC 1 - 2 February 1998
Holby City - BBC 1 - 20 January 2000. This was the first entertainment programme involving a person with AS.
Woman's Hour - Radio 4 - 25 July 1995
Rana and Atexander - Radio 4 - 25 July 1998
It's My Story: Different for a Reason - Radio 4 - 23 April 2001
It appears that the BBC has only known about AS since 1995 and there are only four programmes from the 1990s.