Forum Rider Down and/or notification of minor incidents

On the subject above, it is worth noting the Highway Code which covers this issue.

212
When passing motorcyclists and cyclists, give them plenty of room (see Rules 162 to 167). If they look over their shoulder it could mean that they intend to pull out, turn right or change direction. Give them time and space to do so.

213
Motorcyclists and cyclists may suddenly need to avoid uneven road surfaces and obstacles such as drain covers or oily, wet or icy patches on the road. Give them plenty of room and pay particular attention to any sudden change of direction they may have to make.