I'll give that a try when I get a chance and see how it goes.
At the mo, the only reason I used this chip is because I have a couple laying around here, and also I thought that in the future when I see about adding other things to the project etc, I can then use the USB functionality of the PIc to communicate to the PC for things like datalogging etc (not for a long while yet though lol! as just getting my head around the ADCON settings is hurting my brain lol!)

Hopefully, if it is the ADCON's and we get it working right etc, at least this will hopefully help others out using these PIC's as there dosnt seem to be a lot of info from the searches ive done so far as with the 18's been a strange beast compared to the normal PIC's people use etc, so I presume it kind of keeps peopple away from trying to use them more etc.