Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_204_820 ( id number, "date" text, "constituency" text, "c/u" text, "former incumbent" text, "winner" text, "cause" text )

### Question ###
did charles william wyndham or the marquess of worcester choose to sit for bristol ?

### Accurate SQL ###

SELECT "former incumbent" FROM table_204_820 WHERE "former incumbent" IN ('charles william wyndham', 'marquess of worcester') AND "cause" = 'chose to sit for bristol'