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There are quite a few but I have found this site to be very useful...... Ultramarathonrunning
there is athread called wannabe ultra runners on the forum at the moment which is worth reading and joining in..........its for people who are wanting to find support and info on starting ultras.......another good thread is the thread for kit list for ultras as there is debate and advice on there.........
not too many threads going on ultras but they are friendly and worth joining in.....
UR has a championship. I do a few of these every year - http://www.runfurther.com/2012-c-910.html
Those I've done in current list: Osmotherly Phoenix 33 - is a good shorter trail ultra (a good first). Hills not too harsh and footing generally good.Long Tour of Bradwell 34 - is the next level of toughness up, pretty much up or down most the way. DIB point locations are interesting at times (keep an eye out).Calderdale 37 - New route this year, but previous routes excellent - this event just gives you grid refs for CP and you find your own best route between (not as hard as it may sound).Fellsman 61 - Brilliant event, bags several of highest peaks in Yorkshire dales, again there is emphasis on finding route as some paths and sections are quite path/trackless. Brilliant food and support over a truly brilliant fell/trail route.
Also try the FRA fourms (long distance challenges), quite a few on their have ultra trail leanings - http://forum.fellrunner.org.uk/index.php