I'm in agreement with Jerry on this one. I bought a cheap mountain bike and used to dread going out on it, the tyres were so thick I felt like I was pedalling like mad and getting nowhere, it was also difficult choosing the right gear to be in when on the road.
I then got a Carerra Subway from Halfords under the cycle to work scheme, it's the best thing I've ever bought. I had good Customer Service, every question was answered fully and all the accessories I asked for (Stand, lights, and cycle rack) were all fitted properly. I even got a free 12 month service plan.
It rides like a dream and I can do 15-20 miles which is an achievement for someone like me who never used to take any exercise.
Above all I ENJOY going out on it.
OP If you can stretch your budget a little I would look at the Carerra, one thing I learnt from reading online reviews is to stay away from the Halfords budget range "Apollo"