Bill and James, Thank you both so much, that was a massive help. I will look for those books mentioned Bill and also order the Tiger 1 on the Western Front.
James your history lesson confirmed exactly what I was buying the books for in the first place as to the 7xx Tigers and what company they were in at any point in time, the 504 in particular, wasn't that a Herman Goring unit or something ? If so then that's what I will base it on.

Again thank you both so much I really appreciate you taking the time to help me here.

Mark.