Chiswick hasn't had its own parliamentary constituency since 1997. It is divided between two seats - Brentford and Isleworth which corresponds with the part of Chiswick covered by Hounslow Council and Ealing Central and Acton which you will be in if you get your Council Tax bills from Ealing Borough.
General Election Result - Brentford and Isleworth Constituency
General Election Result - Ealing Central and Acton
To confirm who your MP is go to www.faxyourmp.com and enter your post-code.