Lakeside way twice?
One of my fave routes is the cross border. Start in Kielder, follow the lakeside way for a bit then on to the lonesome pine, over to Newcastleton and back.
There’re options to extend the route as there is now a link to/from Newcastleton village for a cake stop and you could do the full red at Newcastleton too and/or tag on a bit more at Kielder.
If you want to stay local to Kielder do the Deadwater followed by the Osprey blue (great fun). Where that joins the lakeside way turn left and go round that clockwise (food opportunities at tower knowe or leaplish) then on to the lonesome pine and back to Kielder.
When my leg finally stops playing silly buggers you still need to show me that route Neil…