Surly bearing replacement

Hi there,

I have a SUrly 'new' rear fixed hub wih surly 7901 bearings. (deceased)
I have a few questions if anyone can help.

The Surly bearing haven't been that great and no one stocks them anyway, so I'll have to order something and thought I'd step up a bit in quality.

1) How do i remove the bearings? They seem pretty tight in the hub case (I have removed the axle etc. I'm only a partial fool!)
2) Phil Wood's website says his PWX01 bearings are the right replacement and others recommend his bearings. In other places I have seen these specced as 6901 bearings which aren't the same as 7901. So is there any problem here?
3) If they are ok where can I buy some in the UK?

Hope you can help.

These will do the job
http://simplybearings.co.uk/shop/index.php?cPath=3_4474_4588
£2.69 each, post free
not as high quality as these
http://www.charliethebikemonger.com/sealed-cartridge-bearing-7901-angular-contact-bearing-for-surly-hubs---12x24x6mm-2723-p.asp
which are £8.00
tap them out with a screw driver and a hammer from the inside, fit them by tapping them in with something like a socket that presses on the outer of the bearing
Make sure you do it gently, and keep them straight
It is such a simple job!

Or indeed in a pinch the old bearings will work for pressing the new ones in.

Good thread/guide here:
http://www.lfgss.com/thread76254.html

Thanks