Waterproof walking shoes (Denford NN14)

I'm looking for waterproof walking shoes that would see me through a walking holiday in Scotland (I'm a novice walker).
I'm a women's size 6 for normal shoes (perhaps these should be slightly larger to accommodate thick socks?) and importantly a wide fit - any colour or style. Doesn't matter if they're marked or well loved, as long as they'll keep my feet dry :-)

Thanks for reading.