Darwin's studied plant movement and did experiments on carnivorous plants (not the same plants fortunately). He also wrote about the domestication of animals, and about emotions in man and other animals. You probably already know about his studies of barnicles and earthworms. For each of these topics, and quite a few more, Jones tells of Darwin's work and goes on to explain how the topic has been studies since Darwin's time. The final chapter looks to the future, and in particular to the threats to the biodiversity which so fascinated Darwin.
There's plenty of interesting material in this book, but I felt that the first couple of chapters rather lost their way, straying too much from the 'Darwin in England' theme. For this reason I wouldn't see the book as a winner of the 2010 Royal Society Prize for Science Books. After that, however, the book did settle down to become a highly enjoyable read.