Yep...here's the thread ^_^ http://www.micra.org.uk/threads/micra-keyless-go-steering-ignition-lock-jams.38758/
I randomly came across it on Friday LOL
my dad made some Graphite powder by using a posh glass nail file on one of my 9B Artists pure Graphite sticks 
if you do this, don;t use an ordinary emery board or sandpaper, you don't really want to risk anything other than the graphite powder getting in the lock
He put a bit in the ignition, after taking off that twisty kn0b thing, put the key in, wiggled it a bout a bit, and put some more in there for good measure...more wiggling of the key
My mum's not had a single, pain in the arse, Jam up since
...she has the keyless entry
acording to posters in that thread, and another I found made around the same time, it took a few days to get right into the whole lock system...might not work right away, but it did on my mum's SVE ..even though it's only been 2 days
ETA: Other threads from 2009/2010
http://www.micra.org.uk/threads/k12-ignition-barrel-steering-lock-start-problem.38786/#post-407834
http://www.micra.org.uk/threads/k12-start-ignition-barrel-problem.32067/#post-407432
it's strange as I had done searches before and never found any of these
