Yeah, don't touch furnished properties - it's a con. I managed to get everything I need (that includes TV etc.) from IKEA, Argos and the like and spend less than £1K. Look at it as a 'now' living arrangement, not forever. Who knows where you'll be in 12 months time.
I'm not sure exactly where you live (I guess, from your code, it's south of Brum), but I would think you should be able to find a decent size unfurnished for less that £700 pm. I guess, if I've got your location right, the London commuter market has an effect, but just keep reminding yourself - 'now, not forever'.
M 45 W 52 SD22 S9 D8 BD 6 April 2015 Not living together 4 Dec 2015