I've been training to do marathons/half marathons for 10 years on a treadmill in the garage and then when it gets warmer I go on the road.
Over the last year I've done no running but got back into it 1 month ago but my treadmill decided to die

I looked around and found this place -
Restyle Fitness in Wakefield and they sell refurbished Nordictracks -
http://www.nordic-track.co.uk/webapp/wcs/stores/servlet/Product_-11_11851_12702_19006_34851
A review here -
http://www.treadmill-running-machine-review.co.uk/nordictrack_C2500_treadmill_review.html
I can't tell you how good this machine is but :
* 2.5 HP DurX™ Commercial Plus Motor
* 0-12 MPH Precision 1-Touch™ Speed
* 0% to 12% Quick Incline™
* 20" x 60" Running Treadbelt
* DuraSoft V™ Adjustable Cushioning
* 325-lb. Weight Capacity
* Club-Design CardioGrip™ Heart Rate Monitor
* 16 iFit® Weight Loss and Classic Workouts
* Grafixx™ Hi-Resolution Display
* Training Zone Indicator
* Interplay™ Universal iPod® Dock
* Competition Training Centre
* iFit® Fitness Journal
* CoolAire™ Workout Fan
* iFit® Workout Card Technology
* AirLight™ Shock with Self-Locking Latch
* Lifetime Frame, 10 year motor and two year on site manufacturers parts and labour warranty
The programmes on it are amazing and every day since I've had it (2 weeks today) I run against 4 computer generated characters over 3 miles.
You can see them from above on a 3 mile track and from the side - the display is excellent.
I've already shifted a stone and gone down 2 holes on my belt (over the last month).
I'll post pics later of the display.
It cost £495 (refurbished) but it's one of the best buys I've made.