I have not changed any settings what so ever only did a rescan as per the original post.
Ive take a couple of screen shots of my issue to make it clearer.
Picture called EPG1 shows that beyond a about an hour TVNZ channels have no EPG whereas the Mediaworks ones do and also have the little logos that EPG collector can upload.
Picture called EPG2 is my guide settings, under the listing menu. The two at the top have the EPG collector end whereas the 2 x TVNZ channels there is no EPG collector option. Furthermore before the re-tune there were 44 listing selections and after there is only 34 of which I believe are the missing TVNZ channels.
Its so frustrating as all I did was a re-tune.
Thanks for any suggestions