Didn't he admire the British culture in general? If there's a reason mentioned, it's probably in the talks he has with Harker early in the book. I'd have to look at that again to know if such a thing was mentioned.Great book. A lot of folks probably never read it because of the movies. Was there ever any explanation given in the book as to why Dracula wanted to move from Transylvania to England? That always struck me as odd and risky from the old Count's perspective absent a good reason.
EDIT: according to this it isn't specifically mentioned, but London at the time was pretty much seen as the capitol of the world (by the writer at least):
What were Dracula’s true motives in going to England? - Science Fiction & Fantasy Stack Exchange
As mentioned in the first fragment, there are millions of victims for him there. It was probably hard for him by this time to find enough in his homeland.