In reply to kieran b:
I asked this question a while back before buying my first place.
I called a surveyor and a partner of a quite large surveyors firm told me that I probably didn't need one and If I had perticular concerns i should contact a specialist eg. structural engineer.
The house is a 1902 2 bed mid terrace. I had a couple of viewings and had a really good poke about, inspected the roof inside and out, etc.
In the end I didn't get a survey and so far I haven't regretted this choice.
I knew that the chimneys were dodgy, I knew the flashing had gone on part of the roof, I knew that there were cracks in certain places, I knew the boiler was old and I knew that if I had got a general survey they would have just told to get a specialist structural survey and get the boiler checked by a corgi/gas safe person.
In pulling the place apart for refurbishment I have found a few worrying things, but these were things like woodworm in the bathroom floor and really dubious wiring in the kitchen. In these cases the surveyor wouldn't have found or flagged up anything because they wouldn't have lifted the bathroom floor and wouldn't have pulled the wood cladding off the kitchen walls. And anyhow, the electrics had supposedly been checked and signed off.
No harm in making a low offer, they may say yes, they may make a counter-offer or they may just say no. Either way it doesn't cost you anything and you gain info about the seller.
I offered £77k on a house listed at £90k, they came back and asked for £85k, I told them there was no way on earth I'd go above £80k. I left it with them with a warning that I was close to making an offer on another place and they got back to me the next day accepting £80k.