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Did this a few years back - https://www.strava.com/activities/682411092
Was pretty good, the only change I can remember would be at 22.6 miles to go College Rd and then Tibbs Hill Rd as the way I crossed the M25 was a pretty rough track
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this
I've done this ride a few times (Rapha London>Manchester route in reverse) and it's great - are you planning to do it all in one day? As it's tough that way round, with about 70km of Peaks at the end.
If you're breaking it up over 2 days, The Boot in Repton is my favoured stop - leaves you a lumpy but short 2nd day into Manchester. It makes it a much nicer trip than trying to do it in a 1-er.
You can cheat in the Peaks and do a bit up the A515 into Buxton which is flatter and faster (but not as nice)
In 2015 I attempted this route. If I remember correctly I took the route that Rapha was using from Manchester to London and then changed it to start from Sheffield. You could probably google the original. I did cave after about 10 hours ish and got a train home from Northampton but from what I can remember it was a nice route mostly lanes with very little traffic.