Hi Liam,
I used to ride a MTB to work. 10 miles through city traffic. Full Sus, 26" knobbly tyres. It was painful! I averaged a mear 7mph and was is not fit condition to start work once I got there.
That was a few years ago, and when I started cycing again last year I revisited that bike and my old route to work - wish I never.
Thankfully that bike got stolen and I was forced to buy a new bike through cycle to work. I got a Felt QX75 (hybrid?). 700c wheels, slick(er) tyres, and non suspension. She flies and is an absolute dream to ride. Just completed a 50mile ride on her and enjoyed it.
My ride to work now is 15miles through country lanes. I'm averaging at around 12mph and when I get to work a look more like I've just taken a walk to the shop than tried to swim through treacle for 2 hours.
In short, get the 'hybrid' you won't regret it.