Hi Damned, and many thanks for the reply.
Essentially all skill/action rolls (moves) involve rolling 2d10 added to an attribute modifier. In all there are ten attributes and each of these has a modifier (and only a modifier) as its actual attribute. The modifiers for these stats can be +3, +2, +1, 0, -1, or -2.
To the best of my knowledge (limited to quick start rules at this point, I'm afraid) this will cover any and all rolls that need to be made. Success will then be measured based on the result of the modified dice roll, with any result up to and including 9 being a failure, 10-14 being a succes with complications, and 15 or above being a success.
There is no dice substitution.
Really appreciate your help.

