Misc: what continent is considered the easiest to defend in the game of "risk"?

Questions

From which London palace did the BBC transmit the first Tv service?

Which british author has the first names John Ronald Reuel?

What is the problem caused by the excessive streamlining on fast cars which the aerofoil counteracts?

Which jockey became a best selling thriller writer?

Frank Sinatra had 2 solo Britsh number ones, Two coins in a fountain was one, what was the other?