Mislead by estate agent....?

I bought my first flat 5 months ago in London. I had a full hombuyers report done which mentioned that the electrics looked new (new fuse box and plug sockets) but that an electical survey would be needed to confirm this. I did not get this survey done as the estate agent confirmed numerous times (it was a big feature of the price negotiation) that the flat had been fully re-wired (I have a taped line at work and so have recorded evidence of this). I have now discovered that the re-wiring was not done and, as the current wiring is dangerous, it needs to be done at a cost of over �4,000. Can I get any legal comeback against the agent for mis-representation as the price would not have been agreed if the truth had been known?