The downside of Canix races is that they are all over the country and usually only 5k. (the major exception being the 1/2 marathon on the Neolithic trail). They are usually fairly pricey too, and expect you to have all the 'right' gear, which naturally they sell.
The upside is they are well organised and have a good atmosphere.
Hey GB, good to see your marathon is coming on. Thought about it yesterday as I was standing on the A37 marshalling the Wessex Ridgeway as usual. Its about time your club put a team in and tried to stop the Doddlers sweeping the board again.