THE ancient British sport of archery no longer enjoys such publicity as it did in the days when Robin Hood used to split peeled wands at hundreds of paces away, and the English bowmen drove their arrows through coats of mail. But the longbow is far from being extinct either as a weapon (witness the recent big-game expeditions equipped only with bows and arrows) or as a sport. Mr. Inderwick, who gives this afternoon's talk, is a former English champion of the bow.