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_name_84 (tonnage_grt INTEGER, nationality VARCHAR, ship VARCHAR)

### Question ###
what is the least tonnage grt when the nationality is british and the ship is kidalton?

### Accurate SQL ###

SELECT MIN(tonnage_grt) FROM table_name_84 WHERE nationality = "british" AND ship = "kidalton"