I really enjoyed this TR.
Next time you travel to the far north (or for others considering it) a marvelous loop that can be added easily. It entails heading south from Tongue past Ben Loyal to Altnaharra, then back to Loch Eriboll and Durness via an un-numbered road (one of the loveliest and loneliest in Britain IMO) which passes an ancient
broch near the foot of Ben Hope. Map -
https://goo.gl/maps/8TquEBbym382 . This detour takes around 2 hours and covers some stunningly beautiful country, e.g.