After reviewing the post-event survey (February 2015) it appeared that the level of support was lacking for many, but not all walkers.
The essential problem was a lack of coordination of the support staff as to where and when to be present. Also, support staff did not appear to know enough about the event and where to go. A support member on a bike in touch with the team would help, especially in the later stages.
Some of the issues are chronic problems for a long free-style walk where the distance between walkers grows and it gets harder to cover everyone.