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No, but my father in law is a builder so we're fortunate enough to get the work done for free-ish. I wouldn't trust him to work out the load calculations/get the relevant sign-offs sorted though. Had a guy round this morning actually who says he'll charge just under 300 to do all the calcs/get the drawings sorted. And, the Buildings Control application with the Council is just under 200. I know the big cost is the work itself, but thought these additional costs could be helpful for you.
Edit: guy this morning said that it'd probably be about £2000 if we were paying someone to do it. That's for about 3 metres of wall being removed and massive lintel being put in.
I'm considering the same thing. Have you had any kind of quotation for the work yet? As of yet, I have no idea what the likely cost is to the structural work and make good again.