It should be obvious that your house is not traditional build by knocking your hand on the inside of an exterior wall. I would complain to the surveyor, but as for your enjoyment of your home and the value of it, they should be exactly the same. My last 2 houses have been timber frame and aside from having to use different types of fixings to hang pictures, the only difference I have noticed is that they are easier to heat and less inclined to damp - the walls always feel warmer to the touch than brick ones. In terms of compensation, I would expect that you should be due a refund of your fee or resurvey of your property. That's what i would ask for anyway, amd see where that gets you.