music: 60's Chart Toppers: Name The Artist: Chug-a-Lug?

Questions

"AD" after a date signifies a number of years after the birth of whom?

Which animal is associated with the beginning of a MGM film?

What is the large stone circle on Salisbury Plain's called?

What type of flag is shown to the winner of a Grand Prix motor race?

The M25 motorway circles which city?