This my route typed in haste. Might do it properly as a web page.
LE.
Penzance - cycle track from bus station to Marazion.
Minor roads to Redruth, Truro.
A390 - St Austell, Liskeard, (good cafe in Callington), Tavistock.
Across Dartmoor to Moretonhampstead (don't be put off by arrows on map
- only short sharp hills and long descent).
Through Exeter.
Minor roads to Cullompton
A38, Wellington (good cafe "The Europa"), Bridgewater, minor roads to
Cheddar, over Mendips to Shipham.
A38 briefly then minor roads to Clevedon, Easton in Gordano,
cycletrack (hard to find) across Avon bridge.
Avonmouth A403 to Severn bridge, Chepstow, Monmouth, Hereford,
Leintwardine.
Minor roads to Bishops Castle.
Shrewsbury. Wem. Whitchurch.
A49 to Wigan (minor roads possible but best to get it over with) to A6
at Preston
A6 to Carlisle or what I did was diversion to Windermere, Kirkstone
Pass Ullswater, Penrith.
Carlisle to Longtown (avoiding A74), Gretna Green.
Minor roads to Dumfries
A76 to Kilmarnock
Minor roads to Ardrossan
Ferry to Aran
Lochranza ferry to Claonaig.
Oban.
Corran Ferry to Ardgour (avoiding Fort William)
Mallaig. Ferry to Armadale. Kyle of Lochalsh. Duirnish (or Plockton)
Strathcarron, Dingwall.
A9 briefly then Evanton ,minor road to Kincardine, Bonar Bridge.
Lairg, Altnaharra, Strath Naver to Bettyhill (Tongue road hilly I am
told)
Main road to JOG.
1706km on clock.
Longest day last one; Lairg to JOG 156km
Average 122km day

cheers

Jacob