Thanks again for all the replies, chaps.
Here's the full story:
I went to my local Honda quad place (which apparently are very well respected for being possibly the best in the UK - how lucky am I!?). I spoke with the head mechanic there, and he told me if the bearing isn't a tight fit going in to the knuckle/hub then it needs changing (the knuckle). He said he's changed literally hundreds, and now he doesn't bother fitting the knuckle back on if it's not tight going in, as he just ends up having to take it off again.
So with that in mind, I bought the knuckle from the parts dept. Brand new, genuine part, with bearing already pressed in, dust seals in place AND the bottom ball joint - £62 plus VAT! I couldn't believe it. That's so cheap. The guy on the counter told me the prices for Honda genuine parts have come down so much in the last 18 months, and that coupled with the amount of spares they order means a good deal for me.
So tomorrow I'll hopefully be fitting that knuckle.
And yes, it was a genuine bearing and seals I fitted yesterday. Oh well, I suppose I've got a couple of spares ready to go on now!
I'll post back here when I've done the job...
Last edited by Paologray; 01-12-2017 at 04:42 AM.