I'm on my Brompton pulling away from a stop this morning and I feel the back wheel wobble in an alarming fashion. Stopping quickly as possible I check the bike over and somehow I've lost one of the bolts holding the rear spindle in place. The replacement part would be £20 but Brompton recommend only dealers fit the part. Also, the bike is only 3 years old. Does anyone have any experience of the same problem and know whether or not it's possible to fit the part yourself? If not, is it covered under the five year warranty, and would it take long to get fixed? Essentially I'm trying to fix it as quickly as possible and would appreciate advice from the good people here on the best way to do that. Thanks all.