What kind of competition was it at San Siro at 18:30 GMT?
CREATE TABLE "friendly" (
  "date" text,
  "time" text,
  "competition" text,
  "opponent" text,
  "ground" text,
  "score" text
);
SELECT "competition" FROM "friendly" WHERE "ground"='san siro' AND "time"='18:30 gmt';