Sorry to hear this, it's so annoying, happened to me by London Fields a couple of years ago. I've since swapped out some of the stem bar cap and stem steerer clamp bolts for pin torx ones (can buy easily enough Clerkenwell Screws and maybe the special bit too). I might have one or two spare if you'll be parking up again in Hackney. Also have a ton of new (but basic) brake outer cable you're welcome to.
Sorry to hear this, it's so annoying, happened to me by London Fields a couple of years ago. I've since swapped out some of the stem bar cap and stem steerer clamp bolts for pin torx ones (can buy easily enough Clerkenwell Screws and maybe the special bit too). I might have one or two spare if you'll be parking up again in Hackney. Also have a ton of new (but basic) brake outer cable you're welcome to.