Common things are brake or mudguard rub, if it’s bearings then it’s easy to service, refer to link below for bearing spec
https://thebromptonman.blogspot.com/2018/07/notes.html?m=1
I thought of this initially and checked the rear wheel is there was any sort of rubbing, but this grinding noise is only noticeable when I am coasting hence the rear wheel hub would where the issue is (I hope)
@HoKe started
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Common things are brake or mudguard rub, if it’s bearings then it’s easy to service, refer to link below for bearing spec
https://thebromptonman.blogspot.com/2018/07/notes.html?m=1