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Bikepacking - For all you need to know about bikepacking, I recommend you join Bikepacking.com, it's around £70 a year, for that you get access to all the routes and get sent some goodies twice a year, including a couple of their books.
Mountain Biking - Global Mountain Bike Network or GMBN is the oracle for all that is mountain biking, for those just starting out to world class riders. Watching the weekly Dirt Shed Show will educate you on this high addictive hobby!