Lets start at the beginning........there's two general ways of "doing wind" - shove the power into a battery bank, then use the battery to power things, OR grid-tie- whereby you attach the turbine to the grid, using it as your "battery"............There are pros and cons of both ways, but to answer your immediate question in a roundabout way, if you use the average amount of electricity, you'd probably need a 2.5kw turbine to supply all your needs (and that's assuming you're in a good spot for wind), which is over twelve times the power of the turbine you've mentioned - to "do the job properly" whether battery or grid tied, you're probably talking a minimum of £10k all-in....... It's loads more complicated than that, but I hope it gives you some perspective..........
IF you have a good wind resource, it can pay back very swiftly, and be worthwhile lashing out quite a wedge, my advice would be to look at it extremely carefully (we'll be happy to help), and if you do decide to do it, don't skimp!
