Quick tip... when negotiating there's often a case of someone buying into another's 'frame'. So someone might ask you to 'pop over' to see them. So they're saying two words, and expecting you to make an investment of time and petrol. I have fallen for this once this year by conforming to 'social norms' or just not doing enough research, but won't in future.
Best frame is 'win win'... where both people want positive outcome, and will invest similar amount.