Hey, Graham.
Welcome to NT!

Consider posting to some hydrocephalus forums, too. (There's one here, and I have lots of others I can give you. Just send me a private message.) It's awesome that you're doing so well! I hope your nsg let you know, though, that shunts don't last forever, so you'd be wise to be aware of the failure signs:
sudden, severe headache
confusion
lethargy/fatigue
difficulty walking
faintness upon standing
nausea
vomiting
vision difficulties
The NT hydro forum is here:
http://neurotalk.psychcentral.com/forumdisplay.php?f=14
I hope to "see" you there!
LIZARD