The Exmouth Exodus is a wonderful ride. I've done it twice now, both in appalling weather, in 2007 and 2009, and loved both editions. I can't wait to do it in nice weather, which, if history is anything to go by, should happen next year as in every even year. :)
Do keep us posted on the Bournemouth one--I haven't heard about that one yet.
Seems its been about for a while.
http://www.dorsetdash.co.uk/
Not the best option for fixed but still looks like a good route.