Seems like they are testing out / planning out how they are going to serve some of new parts of the route which involves Easington and Loftus High Street. According to Bus Times, 26279 - SN69 ZHD went through Loftus High Street up to Eastington then south onto the A171 and then northwards to liverton then went on through to turn back around at the turning area just outside liverton mines before going back south again. Seems abit of a madness route if that is the one they want to take.

I must add the road south of Easington (Grinkle Lane) is insanely bumpy and get smaller at certain points. Is quite scenic though.