Phew, after a bit of headscratching ive got the DT_HID working with the DT_INTS-18 after having a bit of a fight with just getting the USB to recognise first (guess who used CLEAR in the wrong place LOL!!! )

Once I had the USB recognised, I simple added my own interupt as per usual with the INTS-18 and it worked.

One side effect with this is that in my main loop where the test counter i displayed was slow as it added 1 each cycle of the main loop is now racing along at a hell of a a faster rate wheras before it counted up at almost 1 per second. Not complaining though lol! as if this has kicked everything up a gear thats fine by me!