Staircases in North East England come in many varied sizes and shapes, with 'fans' of steps at the top or bottom, sub-landings, etc. It's often possible to fit a transfer platform, construct 'infill boxes' or use two straight stairlifts. Any one of these options could be cheaper than a curved stairlift, and your experienced Acorn Surveyor will be able to advise you on the best option.