@OB1Knobby 's post I quoted was from much earlier this year (2016). Quoting the post will have given him an 'alert' and he was online earlier this evening so hopefully will pop up and comment. Here's
my route, well adapted from the one I planned and rode (Sep 15). Serious avoidance of A roads.
Have a look at this route which I've knocked up:
image and Ride with GPS: "
LEJOG - Almost NO A roads" I have done a fair proportion of this route either during my end-to-end or on other trips.
A quick check suggests about 25km of A roads in the first 1500km which gets you to Tain, excluding the "A" roads on Isle of Arran and on the Kintyre and Sunart peninsulas. Camel Trail north of Bodmin. Canal side through and NE of Taunton. Strawberry Line Axbridge to Yatton. Banks of the River Wye north of Ross. Cross Wenlock Edge to the Hope Dale SE of Shrewsbury. Cross Delamere Forest (S of Runcorn). Widnes/Runcorn Bridge. Mostly B roads through Widnes, St Helens, Billinge, Orrell, Ecclestone, to cycle path through Preston. NE to Slaidburn and across the 'Forest' of Bowland to the Lune valley. Tebay, Orton, Lyement valley to Penrith. Back roads to Carlisle and then Gretna. B roads across to but then bypass Dumfries and back roads up the Nith valley to Kirkconnel. B roads and back roads to Ardrossan. Ferry to Arran and then ferry again to Kintyre. N to Lochgilphead, then Crinan Canal side before turning N to Kilmartin. Off on B840 all the way up Loch Awe and then NCN route across to Oban. Ferry to Mull and then back to Sunart peninsula (mainland) on Fishnish/Lochaline ferry. Up W side of Loch Linnhe to Camusgaul ferry to Fort William (timings important - alternative is Corran ferry and up A82 or carry on right round Loch Eil - extra 30km). Good cycle path up the Great Glen: canal tow path and rougher track NW of Loch Lochy all the way to Fort Augustus (NB when are the Scots going to start renaming all these colonial/English monarchy/nobility names, I wonder). B862 and back roads to Inverness, SE of Loch Ness. Zigzag W and N to Dingwall and back road to Evanton, Alness and NCN route to Tain. Cross Dornoch Firth on A9 and(with some detours on back roads follow to Lothbeg (10km NE of Brora). Mountain road to Strath of Kildonan and up to Kinbrace, W to Syre and join Strath Naver to Bettyhill. NCN route E to JoG.