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Bit late on this, but I'm not wild about the section between miles 53-58. Live fairly nearby and they're quite traffic heavy, fast roads, particularly the section along Totteridge Common.
I'd be inclined to take Quinta Drive, Mays Lane (I have a weird fondness for this road. It's a bit no man's land and has a proper farm on it.) and Barnet Lane instead.
If you're looking for a bit of gravelle you could cross Arkley open space, go down Arkley Lane and then over onto Quinta Drive.
You have to access Arkley Open Space from Galley Lane though. Don't be fooled into thinking there's another way over/under the Barnet bypass like the Komoot map seems to suggest. Learnt that the hard way.
Can anyone have a quick look at this (its been a long while since I last went up that way), just to check that I haven't missed a gem of a road, or have chosen a pig of one:
https://ridewithgps.com/routes/38965076