Thanks for the feedback Meg, and a couple of other recommendations too which is a bonus. I've just ordered them from my library so should keep me going for a while.
I was getting a little worried from your comments that I should have chosen Cranford instead which is much shorter! I'm glad you enjoyed it, hope everyone else does. For me the mix of history/travel/adventure/science was most appealing and made it very different to my regular reading.
I agree the characterisation was not the best (dare I say this can be the case more in books written by men?). However I think the book has a point to make in putting Darwin's "discovery" firmly in the context of the findings of others which were already available at the time, and maybe bring him down a peg or two from his place of universal acclaim.
I'll send you your next book tomorrow or monday. Have you peeked yet at the relevant thread??