I found a better solution when looking for some bikes a couple of years back:
You want a bike, say £1000?
It's 2014.
OK, so find the bike you want, then find the 2011 or 2012 model of said bike on a website which is selling old model stock (plenty do) and it'll be £500-£600 max.
I paid £400 for my wife's bike in 2012. New model was £850 and spec was exactly the same. I bought the 2009 one.
Quite often, the only difference seems to be the styling - so enthusiasts would know it was older model but who cares about that?
Maybe I just got lucky at the time, but there were quite a few bikes like this available where you got it for 50% because the colour/style of the frame was 3 years old! Actual technical spec and materials used were the same, or almost the same (not a noticeable difference in performance to any but a pro)
Stick this on an 18 month 0% purchase credit card and you have your interest free loan. even better one actually because you just pay a 1 off fee 18 months down the line, meaning that money is invested so even better.