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@simonw7
honestly - 0.02mm is not going to make any difference on a seat post.
I converted a Dawes bike earlier this year which had an old 26.42mm seat post, and replaced it with a 26.2mm post made by Push, it fits fine and have had no problems. So if you can get a 26.4 then that's even better.
Sine then, on another rescued bike i restored for my son, i took a wad of kitchen tin foil to the rusted seatpost and rubbed it on the rust with cold water, and in about 10 minutes it was gleaming. Wish I'd done that with the Dawes and saved £20.