Another idea someone who's had this problem may have tried, can you strip the hub down completely and give it the best clean possible in order to free up the seizing bearings?
[Yes I could try it and find out, but would be nice to know if I'm wasting my time before hand :d]
Surely with how common a problem this seems to be, someone would have experienced & solved the problem by now?
I believe it's name is the 'hub carrier bearing', it's located at the bottom of the hub [as it is on the car] and allows the hub to swivel in order for the wheel to turn. There is also a bearing at the top of the hub, but as it is the lower one that's carrying the weight it seems to be this one seizing up.
The garage had it all stripped down the other day so they could fit 2 new drive shaft boots, and that's when the problem became conclusive. They advised 2 new carrier hubs and labour would be over £900 all in. That's money I wouldn't pay even if I had it, which I don't! lol
I found plenty of threads on the 'meganesport' forum relating to this, and you're quite right, the stealers only sell the hub with the bearing ready fitted. I've found a guy who claims to be producing a separate bearing which can be fitted to sort the issue. So there may well be hope yet.
If anyone is interested or wanted to read up on this problem here is the link to what I'm going through: