Thank you random forumite!
Following on from http://www.bikeradar.com/mtb/forums/viewtopic.php?t=12707047, I am pleased to report, my mojo and I have been reunited! Today's trip to Chicksands was the best I think I have had - flow, speed (ish), and a damn good time! So thnks to whichever forumite found my mojo, and sent it back to me! I'm back to being a happy biker again!
Old hockey players never die - they just smell that way...