First job as a freelancer in Uk, need daily rate information

Hello,

I live in Uk and work in animation. I may have an opportunity to do a short job for a very big animation compagny in london. They need 2-3 concept backgrounds, and my daily rate. I do not know more about what they want.

I guess It would be a freelance job. I've never been freelancing, even in France where I'm from, and I am currently looking for all the information on internet.

But for now, I'd like to know what is the average daily rate for an illustrator, knowing it's not a small compagny.. so I can give them an answer quickly!

Any information would be very helpful!

thank you very much