What should I include in my Oxbridge personal statement to show passion for my subject (eg History) outside my A Levels?

For History, you should try and consider 1 or 2 areas you're really interested in, for example the Tudors, or Gender History. Oxbridge really like 'super-curricular' activities, which are things you have done directly related to your subject outside your A Levels. Try to include these and link them to the area you're talking about. For History, this can include visits to historical sites, exhibitions, essay competitions and in particular, books you've read outside your A Level requirements. The important thing here is not just to list everything you've ever done to do with History, but think about them critically as this is what you'd have to do at University. A key question to ask yourself is what did I learn from this, or what did I find particularly interesting. They will look for you to have your own opinions on things you've included. Particularly for the books, it is important not just to name drop them or include as many as you can remember, but pick 2 or 3 which link to an area of History you're really interested in. They would much rather you only spoke about 1 book in detail than 6 which you haven't thought critically about. 4000 characters is not a lot, so if you have further thoughts about the books or any other super-curricular activity you've mentioned, note them down and they are likely to come up in your interview. Although Oxbridge do look for super-curricular activities, it is also worth mentioning any extra-curricular activities, but like the super-curricular activities, link them back to academics and perhaps explain how they would help with attributes such as time management or perseverance.