I do English lit and history, along with French and sociology, and I don't regret choosing any of them. I think the fact that I'm one of very few people in my year who haven't dropped or changed at least one subject shows that I thought about it and made a good decision the first time around. The combination of subjects you've chosen is excellent; all very well-respected and an equal balance between the arts and the sciences. I didn't find the gap in either English lit or history to be very big. In English lit, you're expected to think for yourself a lot more and there's more emphasis on poetic techniques. In history, the style of questions, ie some source-based and some essays, is pretty much the same, but you have less time to do them in and obviously there is more to learn in more detail.