Forums:
Parkour.net - a site and a forum for every one who would like to discuss parkour and find out more information on Parkour and what it is.
UK parkour Forum - This forum is good for looking up all local events going on in your area (i.e. Norfolk)

Site Links:
www.ParkourAlliance.com - A business devoted to teaching Parkour to Young Traceurs in schools.
ETM - A group of traceurs based in norwich
Kiell - Parkour and freerunning Photographer
3run.co.uk - a tricking, wushu and parkour site with loads of info!
Northern Parkour - North of England area's
Dilate Clothing - A UK/Norwich based urban clothing company grouping the UK music, skateboarding, parkour, breakdancing and graffiti art scene's