I'd like to nominate the morning 0918 service between Chathill and Seahouses

The AM trip connects with the train TO Newcastle, but not with the arrival.

It could easily operate in service as far as Seahouses as that is where the vehicle drops in to service next on the 418.

I wouldn't be expecting a throng of people using it. But It would be extremely handy for walkers if this connection existed. Plus it would make a dead trip live at no cost.