Kate won the award for 'I am Ruth', a mini-series, which revolved around a mother who is trying to help her daughter get over her addiction to social media.
Syal, has starred in hit BBC comedies, 'Goodness Gracious Me' and 'The Kumars at No 42'.
The Netflix drama is based on the 1928 novel by German author Erich Maria Remarque about the horrors of World War One from the perspective of a young German soldier.
Austin beat Colin Farrell, Brendan Fraser, Daryl Mccormack, Paul Mescal and Bill Nighy while Cate defeated Viola Davis, Danielle Deadwyler, Ana De Armas, Emma Thompson and Michelle Yeoh.
"RRR" was in the longlist for the 'film not in English language' category but couldn't find a spot in the segment's final nominees list, which were announced by British actors Hayley Atwell and Toheeb Jimoh via a livestream.
Rohini Hattangadi was the first Indian actress to win the BAFTA Award for best actress.
The initiative marks BAFTA's first steps into India.
BAFTA said further details about its eligibility period will be announced soon.
Joker won three awards which include the best actor for Joaquin Phoenix and the British Academy's inaugural casting award.