Pedals & Handlebars

I bought my first mountain bike six weeks ago from Halfords, the Voodoo Hoodoo, I'm really pleased with it apart from a couple of things I'd like to change, I've been around the red route at Sherwood Pines a couple of times and once around Follow The Dog at Cannock Chase and on those trails I've had trouble with my pedals where my feet have slipped off a few times, my feet are a size 12 and are wide, I'm looking for a wider pedal, I don't want to pay the earth so I'm thinking of something up to £60, I'm also after some wider handlebars, I'm not sure what size they are on my Voodoo Hoodoo but they just don't seem wide enough.