UnScramble this Word: e r e t s n s p?

Questions

Which National Trust Property was the location for Mr Darcys home in the BBC 1995 adaptation of Pride and Predjudice?

What is commemorated by the Hindu festival of Janmashtami?

Which chess computer made history by beating a grand master by a score of 3.5 to 2.5 in a series of games in 1997?

What was the name of the town in which Gilbert and Sullivans The Mikado set?

In the song which begins A frog he would a wooing go, who says Heigh Ho?