Great thanks - I'll give that a go.
Yeah, actually I've got a bit confused between turps, naptha, white spirit and mineral spirits. According to google real turps and white spirit are not the same:
So it seems that white spirit might be right thing for this? I just need something to thin down the poly?Real turpentine is a natural product taken from a trees sap. White spirit is a distillate of paraffin oil. Turps substitute is a distillate of petroleum. White spirit is a far cleaner and better thinners than turps, and to the touch feels less oily.