Fixed it seems, will report back if I find instabilities.
dmesg and lsusb showed everything to be as it should.
I did two things to get it working; 1. forced LNA on, which has to be done in 810 as well, except the options file used to be "/etc/modprobe.d/options" - since ubuntu 9.04 it is "/etc/modprobe.d/options.conf" (file has to be created). 2. It seems the cards are once again suffering from the infamous "warm restart" issue, i.e. if you reset your core, you must do a "cold restart", or the tuners don't wake up.
The information is now in the wiki - is this something that needs a ticket?