Very methodical. Did you follow a schematic or just work it out as you went?
I have an old wheel (and BWR hub) and I planned to do this with mine. But have not yet got around to it.
I'm convinced that if I ever do, I'd lose at least one of those bits...
Thanks, I did look up some info online about how to get started, but it was all a bit sketchy. So for the most part I made it up as I went along, luckily unlike SA hubs, there were no awkward springs or anything that needed fancy tools, it was a very straightforward job. I do try to be methodical and take lots of photos, because even with diagrams there is invariably an extra washer or two that's not accounted for in online diagrams. I did actually strip it a little further than that photo shows, I took the sun and planetary gears apart for a clean as well.
I realised actually after posting the picture, that my hub is a little different from
@Paulus hub, because mine has an additional coaster brake in there. However, I would still be tempted to completely strip the Brompton hub down, the grease can get very sticky with age and cause the problems that has been described. A good clean and re-grease can do wonders and is a very calming job to do!
OP, have you tried SJS cycles for a spare sprocket? Holland Bike shop also carry spare bits for these hubs, but I think they've temporarily stopped shipping to the UK sadly.