(20 May 2021, 4:23 pm)Andreos1 wrote Assuming the 4 isn't going to be doing the full route and will terminate part way?

On the GNE website (from the 29th) it shows as the running a full route journey departing Houghton at 02:06 along with an early morning journey from follingsby to the galleries at 05:11, plus journeys towards heworth at 05:10, 05:25 and 06:48.