lochs& glens north/south or s/n?

the sustrans maps for this route were formerly carlisle to inverness via glasgow, but are now inverness to carlisle. is there a particular reason for this south/ north change? if i take it from carlisle will the signs no longer be facing me so i have to stop at junctions to see the direction?
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He that buys flesh buys many bones.
He that buys eggs buys many shells,
But he that buys good beer buys nothing else.</b></i>
(Unattributed Trad.)
prevailing winds don't necessarily mean that they'll be there for you on the days that you chose to ride...
The worst headwinds that I suffered on my LEJOG and JOGLE rides were from the North as I headed towards Thurso. Overall there wasn't much to differentiate between the two rides on the headwinds front(sic)
He that buys flesh buys many bones.
He that buys eggs buys many shells,
But he that buys good beer buys nothing else.</b></i>
(Unattributed Trad.)
The stretch from Dumfries to Carlisle is pretty flat and gets very exposed around the estuary so a headwind would be very irritating.
the idea is to die young as late as possible