Keira a fan, too

Numerous sources have reported that Keira Knightley has always been a big fan of the BBC's Pride and Prejudice, and that she had to work very hard not to impersonate Jennifer Ehle.

From SuicideGirls (full text),

I wasn’t sure if I wanted to do it because I've been so obsessed with Pride & Prejudice since I was about seven. I have all of Jane Austen’s books on tape and I was obsessed with the BBC version. My agent told me I was being a wuss and that I should shut up.

I was just terrified that I was going to do a total copy of Jennifer Ehle's performance from the BBC version.

From Female First (full text),

"I had this big doll's house which was the Bennet's house and I'd spend hours playing with it. I was Elizabeth. I totally identified with her and Jennifer Ehle (who played her in the BBC series) was my heroine."

And from OptusNet (full text),

When the TV version [starring Jennifer Ehle and Colin Firth] came out when I was nine I watched it solidly for two years, and I was obsessed again. The TV version was such a hit and I thought there's no way I can do it because nobody will buy me as Elizabeth Bennet.