Thanks for the replies, yes it's just the hub and knuckle I'm referring to.
I went with the US kit because I am very limited by budget, but at the same time wanted something that was good quality so I didn't have to do the job again for quite some time. I was wary of the Milners kit because of the reputed poor inner axle seal quality, and although I could have changed it for a Toyota part, I was still aware that there's other seals in the kit and they could be of the same quality but the effects would not be as noticeable as the failure of the inner axle seal. Also I would have needed to add the price of genuine seals, Koyo wheel and kingpin bearings to the price.
The Roughtrax kit seemed a better option. Despite some contradicting statements regarding Terrain Tamer stuff on various boards, the bulk of the opinion came out in favour of it. Again though it has a third party inner axle seal and wheel bearing needed to be added to the kit.
There were many US kits, if I get around to writing a detailed thread about it I'll try and write a bit more about each one, but some of them were out of stock.
The kit I've gone for seems to have favourable reviews and has all of the seals included in the UK kits plus genuine Toyota inner axle seals, Koyo wheel and kingpin bearings. Also different shims for the kingpin bearings if I need them. The kit is £136.85.
Admittedly the postage is expensive and I'll probably get hit with import duty, but I've also ordered some other parts I'll probably need for the rebuild as there appears to be corrosion on some of the parts I'll need to remove.
I will try and get the needle bearing upgrade from Milner, but I think the kit I have got is of good quality (I'll hopefully go into more detail when I do a write-up, hopefully it's true!), and adding up the parts I needed from Milners, the US kit has come in slghtly cheaper even with the postage costs.