CREATE TABLE table_57921 ("Number & name" TEXT, "Description" TEXT, "Current status" TEXT, "Livery" TEXT, "Date" FLOAT)

What is the latest death with a description of BR-Built inspection saloon?
SELECT MAX("Date") FROM table_57921 WHERE "Description" = 'br-built inspection saloon'
SELECT MAX("Date") FROM "table_57921" WHERE "Description" = 'br-built inspection saloon'