Just trying to figure this out from memory, but first step obviously is you need the same bass, amp and mic he uses. Then ya need the same 4 track recorder they used at Abbey Road, using a decent compressor and bouncing the tracks down so you get good saturation on the tape.
As for the playing style, you'd have to check a video but I think he played with a pick and did slight palm muting while plucking the strings. (total guess on my part tho... I've got the 'making of' video around somewhere but don't have the time to check it right now.
A lot of his stuff is running bass lines too.
If you're talking about the songs in general, you should try and get your hands on some of the bootleg Ultra-Trax stuff with the alternate takes on them cause you get a really clear sound of the sessions before they added any processing or vocals. They're also mixed straight out of the board so you get some good isolation on the different instruments.