Thursday works for me, and Arncliffe's fine. I don't think I'll be there till 7-ish, though, as I'd like to add a loop out somewhere...
Dale - it's not far from Northallerton (9 miles) or Eaglescliffe (10 miles), and there's a reasonably late train - 21.47 from Northallerton or 15 minutes later from Eaglescliffe.