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the section out through Mile End and Bow is a bit grim. Plenty of cycle lanes but busy with cars, pedestrians, broken glass but hey, that's London so good luck finding an alternative.
Other than that Colchester was a bit of a faff to navigate although that was our morning coffee stop so perhaps a bit easier if you are passing straight through.
Other than that is was all very doable. A few fast roads here and there but you aren't on them very long and on a Sunday they were fine.
Here's my route from Harwich to Waterloo.
Shouldn't be too hard to reverse it and redirect the final section to Ipswich
https://strava.app.link/OAZeiTI0Zpb — Day 3, Harwich to London, Waterloo