Well sorry to bump a really old thread but there are only 3 with this in the title.
I travel in on the CS7 and have seen a newly placed ghost bike on the northbank junction of Southwark Bridge Rd (
Link to still from GoogleMaps taken prior to the bike being there). There were flowers and cards and it looked fairly recent so I had a closer look.
One of the cards was addressed to a Sebastion. Makes it all the more real when there are messages there. I cross this junction daily and have seen many near misses. There is an
article from last year that mentions the junction on the southbank.
Ghost bikes are an important reminder for the rest of us (cyclists and motor vehicle drivers) to take care. Perhaps we could list all the ones we know about as a useful tool. Forwarned is forarmed.