In reply to tim_broadhurst:
I haven't done all of it recently, but don't remember, or think that, it getting overgrown would be anything to worry about.
When I ran Zennor to beyond Gurnards about three months ago I thought it was really tough running, and I should think it is going on to Bosigan too, based on my walking that bit in reverse a month or two ago. Bosigran to Botallack is mostly pretty easy (from walking and running it last month), then from Cape Cornwall to Gwithian is rocky and hard running until you get to the beach (from memory of a few years ago).
There is nothing dangerous. It is a path.