Bronze DofE is hardly a challenge and to be honest, it's not that impressive by the time you're applying to UCAS (I mean, by that point it's possible to have finished Gold by then). What really matters about it is making sure that you're pulling good skills out of it, so if you do decide to do it make sure to mention things that it illustrates your determination and dedication to something over a period of time, team work skills etc.. That really matters for everything you write down, they don't really give a damn about the fact that you can play grade 6 classical guitar for your psychology application but if you can link a skill from it to your degree or uni application time then you'll be looking much better!