Simple enough to do but you will need two 38mm thin spanners, Triumph do a service tool for the very purpose that has a square 3/4 inch hole in it to allow a torque wrench in to tighten the lock nut down correctly.
I ordered the Triumph tool which came in at about 13 quid, not wanting to fork out on another a quick ebay search showed that 38mm spanners aren’t cheap and probably won’t be thin enough to fit anyway !! I ended up buying a Landrover fan hub spanner which was 36mm and filing it out to 38mm which was as easy as it sounds and cost about 6 quid, top one is the Triumph tool draper fan hub spanner below..
Get the front of the bike off the ground and rotate the steering from lock to lock feeling for any notchiness, take the fork legs and pull to and fro to check for any movement in the bearings, drop the bike back down again..
Then loosen the top nut a a 30 mm socket required for this one, top fork clamp bolts and the clip ons. undo the lock nut and rotate the adjuster nut below to finger tight on the bearings, carefully torque up the lock nut to 40Nm whilst maintaining the position of the adjuster nut with the second spanner.
Torque everything back up top nut 65Nm, top clamp bolts 20Nm and clip ons 20Nm. Get the front back off the ground and recheck for any bearing wear of play as before.