Is there a playsheet available which lists all the details on the rear of the rules book describing the meaning of the symbols, also the details of abilities eg Mobile and shows the Devious, Steady etc priority diagram?

As far as I know there is no such a thing.

Try this. I think you will like it. At the top, there is a front and back rules summary. I think what you want is at the bottom, front and back reference sheet.

http://boardgamegeek.com/filepage/102820/universal-head-warhammer-diskwars-rules-summary-re

Thanks for that link, exactly what I needed. Its on my drop box as a reference sheet and I printed off a copy and laminated it using my cheapo laminator from Wilkies as well!