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My route home (I live in the south of England) was to get the 8:15 bus from KirkYetholm to Kelso and then the 9:05 bus from Kelso to Edinburgh, from where I travelled south by train.
There are also buses from Kelso to Newcastle and many other options besides these - The crucial link from Kirk Yetholm is run by Lowland Scottish - details below.
Further details relating to transport can be found on these sites:-
You can email this site at thepennineway@btopenworld.com