CREATE TABLE table_12984 ("Election" TEXT, "1st Member" TEXT, "1st Party" TEXT, "2nd Member" TEXT, "2nd Party" TEXT)

Which 1st Party has a 1st Member of sir john tyssen tyrell, bt, and a 2nd Party of conservative, and a 2nd Member of john payne elwes?
SELECT "1st Party" FROM table_12984 WHERE "1st Member" = 'sir john tyssen tyrell, bt' AND "2nd Party" = 'conservative' AND "2nd Member" = 'john payne elwes'
SELECT "1st Party" FROM "table_12984" WHERE "1st Member" = 'sir john tyssen tyrell, bt' AND "2nd Member" = 'john payne elwes' AND "2nd Party" = 'conservative'