Well, I tried the "split vertices" option and I wasn't too happy with the results (the whole object became too blocky), adding bevels at this point wasn't really an option, but I eventually found a work around. Once the .obj is UV mapped, I then convert it into a .3ds file ensuring the UV coordinates are retained (I used Explorer 3D for this). When this 3ds file is imported into Poser, the model looks like it is supposed to and the texture map fits it!! Thanks anyway for your help Sharen :)