CREATE TABLE table_48398 ("Region" CLOB, "Date" CLOB, "Label" CLOB, "Format" CLOB, "Catalog" CLOB)

When did the United Kingdom format a stereo LP?
SELECT "Date" FROM table_48398 WHERE "Region" = 'united kingdom' AND "Format" = 'stereo lp'
SELECT "Date" FROM "table_48398" WHERE "Format" = 'stereo lp' AND "Region" = 'united kingdom'