EXCEPT for such famous resorts as Scar-borough, the North Riding of Yorkshire is not very well known to holiday-makers, but its rugged coasts and lovely dales provide endless attraction to anyone whose idea of a holiday goes farther than piers and sand. Tonight Mr. A. B. B. Valentine will describe the sea-coast at such spots as Hayburn Wyke and Robin Hood 's Bay, and such inland places as Farndale, Westerdale, and Rosedale, and Rievaulx Abbey in its glorious setting amongst the moors.