Hiya guys and thx for the replies...
The unknown printer error was a typo on my side.
Certain Groups not mapping printers is also sorted with an interesting outcome.
In my printers.ini I had the first printer of the group that wouldn't map commented out (see below)
as a result netlogon never shows "Found 'Group1' in INI.
In fact it acts as though I have commented out the entire group ;[Group1]
Removing the ; then allowed printers to be mapped.
I then tidied it up by removing Printer1 and shifting all other printers down to this position.... any thoughts ?

I will remain on version 4.53 if you guys are saying this should still work in server 2012
Should I also leave the profile of each user as kix32 or change them all to kix32.exe kixtart.kix ?

[Group1]
;Printer1=1\\ps07sg01\PRN01174, HP Color LaserJet CP3505 PCL 6
Printer2=1\\ps07sg01\BIZHUB_C, BIZHUB C224E
Printer3=1\\ps07sg01\BIZHUB_B, BIZHUB C224E
Printer4=1\\ps07sg01\PRN01242, HP LaserJet 4250 PCL 6
Printer5=1\\ps07sg01\IHGHP2300, HP Universal Printing PCL 6
Printer6=1\\ps07sg01\IHGLC748, Lexmark C740 Series PS3
DefaultPrinter=5