Had to hunt around and found several conflicting posts dating back a while, but this worked:
- backup database
- rename the b2 tables to have the same names as wp tables
- edit config details as needed in the config files each time
- delete ALL b2 files from the server
- upload new wp-072-gold files
- upgrade to wp-072-gold
- delete ALL wp files from the server
- upload wp-1.0.2-blakey files
- upgrade
- delete all those
- upload wp 1.2.2 files
- upgrade
- keep them :)
I have forgotten who in #irc let me have the 072 version - many thanks.
If you need 072 email me and I'll shoot it back at you.
And I have no clue why I just wrote this ..... :)