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I was lightly loaded (~6kg), staying mainly in hostels which sort of dictated my day lengths. I think I also aimed for ~100 miles per day (think I did a little less) averaging around 20 km/h by myself, going steadily. It was definitely nice to have days of varying lengths.
Obviously I did a different route (a bit hillier?) but for info I did Edinburgh-Berwick (a bit too long and weather sucked), Berwick-Seahouses (short day to then spend a day with my parents), Seahouses-Ninebanks (near hadrians wall), Ninebanks-Scotch Corner, Scotch Corner-Hawes, Hawes-Edale, Edale-Nottingham
I did Edinburgh to Ashington earlier this year, before diverting inland and coming down the Pennines to Nottingham. I had tech, but found that section very well signed saving a small section near this Tesco https://www.google.co.uk/maps/@55.8822428,-3.087751,3a,75y,176.56h,80.28t/data=!3m7!1e1!3m5!1s2xcufAQaTGBSu0two_dxAA!2e0!6s%2F%2Fgeo3.ggpht.com%2Fcbk%3Fpanoid%3D2xcufAQaTGBSu0two_dxAA%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D23.076857%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656 which I think is new and has disrupted the signage, it took me some questing to pick it back up after losing it.
Not sure what bike you are on, but worth noting that I found the off road section from Berwick-Holy Island good value on my disc-braked cross bike (28mm slick tyres), fairly heavily rutted grass track.
The Drift Cafe near Cresswell was excellent.
I had route ~on my basic garmin (line only, no maps) but also cut up a cheap road map and highlighted the route which was a useful back up.