If the main flow in the early morning on the X43 is into Manchester and late in the day away from Manchester then maybe they will axe some X43 return workings. Equally they could work some from Starbeck (Harrogate) if the need arose as the main flow on the 36 is towards Leeds in the morning etc. That would allow an earlier Leeds-Manchester working but they do seem to keep all routes to one depot hence the express Little Explorer service to get the bus from Knaresborough back to York rather than basing a vehicle at Starbeck