After investigating the crunchy noises in my Brompton's rear wheel at the weekend, I thought I'd better buy a new set of bearings for it...
I also noticed that the brake pads were almost worn down to the shoes so thought I'd better get some replacements for those too. And a new gear cable while I was at it - the current one is fraying around the shifter, so I keep spiking my thumb on the end of loose strands of wire.
I really ought to replace the whole transmission too but this will be an expensive business, best left until after payday. It will at least be a good excuse to upgrade to the new style chainset with replaceable chainrings.